-AASHTO (1990) "Construction Manual for Highway Construction", Washington, AASHTO
-AASHTO® (1993)" AASHTO Guide for Design of Pavement Structures", Washington, AASHTO
-AASHTO (1993) "Guide Specification for Highway Construction", USA Washington, D.C.
-AASHTO (2003) "Determining the resilient modulus of soils and aggregate materials", 20th ed., Washington, AASHTO
-AASHTO (2014) "Standard Specifications for Transportation Materials and Methods of Sampling and Testing", 34th Edition and AASHTO Provisional Standards, 2014 Edition 4-Guide Specification for Highway Construction, Washington, AASHTO
-Barksdale R. (1991) "The aggregate handbook", USA Washington, D.C.
-Bilodeau, J. P., Dore, G. and Pierre, P. (2008) "Gradation influence on frost susceptibility of base granular materials", International Journal of Pavement Engineering, Vol. 9, No. 6, pp. 397-411.
-Bilodeau, J. P.; Plamondon C. O. and Dore G. (2016) "Estimation of resilient modulus of unbound granular materials used as pavement base: combined effect of grainsize distribution and aggregate source frictional properties", Materials and Structures, Vol. 49, No. 10, PP. 1-11.
-Cunninghama, C. N., Evansb, T. M. and Tayebalib, A. A. (2013) "Gradation effects on the mechanical response of crushed stone aggregate", International Journal of Pavement Engineering, Vol. 14, No. 3, pp. 231–241.
-Ekblad J. (2008) "Statistical evaluation of resilient models characterizing coarse granular materials", Materials and Structures, Vol. 41, No. 3, pp. 509–525.
-Fuller, W. and Thompson, S. (1907) "The laws of proportioning concrete", Trans ASCE, Vol. 59, pp. 67–143.
-Ghabchi, R., Zaman, M., Khoury, N., Kazmee, H. and Solanki, P. (2013) "Effect of gradation and source properties on stability and drainability of aggregate bases: a laboratory and field study", International Journal of Pavement Engineering, Vol. 14, No. 3, pp. 274-290.
-Golalipour, A., Jamshidi, E., Niazi, Y., Afsharikia, Z. and Khadem, M. (2012) "Effect of aggregate gradation on rutting of asphalt pavements", Procedia - Social and Behavioral Sciences, Vol. 53, pp. 440-449.
-Gu, F., Sahin, H., Luo, X., Luo, R. and Lytton, R. (2014) "Estimation of resilient modulus of unbound aggregates using performance-related base course properties", Journal of Materials in Civil Engineering, Vol. 27, No.6.
-Hamidi, A., Azini, E. and Masoudi, B. (2012) "Impact of gradation on the shear strength-dilation behavior of well graded sand-gravel mixtures", Scientia Iranica Transactions A: Civil Engineering, Vol. 19 No. 3, pp.. 393-402.
-Huang, Y. (2004) "Pavement analysis and design", second Ed. ed., U.S.A: Pearson Education Inc.
-Jiang, Y., Wong, L. N. Y. and Ren, J. (2015) “A numerical test method of California bearing ratio on graded crushed rocks using particle flow modeling”, Journal of Traffic and Transportation Engineering (English Edition), Vol. 2, No. 2, pp. 107–115
-Kim, D. and Kim, J. R. (2007) "Resilient behavior of compacted subgrade soils under the repeated triaxial test", Construction and Building Materials, Vol. 21, No. 7, pp. 1470-1479.
-Lavin, P. (2003) "A practical guide to design, production and maintenance for engineers and architects", London and New York: Spon Press.
-Lekarp F. and Isacsson U. (2001) "The effects of grading scale on repeated load triaxial test results", International Journal of Pavement Engineering, Vol. 2, No. 2, pp. 85-101.
-Pan, T. and Tutumluer, E. (2005) "Imaging based evaluation of coarse aggregate size and shape properties affecting pavement performance", In Geotechnical Special Publication, Austin, TX; United States.
-Sang and Kooh Company (2015) "Sang and Kooh Company’s technical report of projects of south of Iran".
-TRB (2013) "NCHRP Synthesis 445, Practices for Unbound Aggregate Pavement Layers", USA Washington, D.C.
-Uthus L. (2007) "Deformation properties of unbound granular materials", Doctoral dissertation, Norwegian University of Science and Technology.
-Xiao, Y. and Tutumluer, E. (2016) "Gradation and packing characteristics affecting stability of granular materials: Aggregate Imaging-Based Discrete Element Modeling Approach", International Journal of Geomechanics, Vol. 17, No. 3, http://dx.doi.org/10.1061/(ASCE) GM.1943-5622.0000735.
-Xiao, Y., Tutumluer, E., Qian, Y. and Siekmeier, J. (2012) "Gradation effects influencing mechanical properties of aggregate base-granular subbase materials in Minnesota", Transportation Research Record: Journal of the Transportation Research Board, No. 2267, PP. 14-26.
-Yildirim, B. and Gunaydin, O. (2011) “Estimation of California bearing ratio by using soft computing systems”, Expert Systems with Applications, Vol. 38, N0. 5, pp. 6381-6391.