1. W. Visser and G. H. Brundtland, Our Common Future (‘The Brundtland Report’): World Commission on Environment and Development, (Top 50 Sustain. Books, 2013) pp. 52–55
2. Y. Xiao and E. Tutumluer, Best Value Granular Material for Road Foundations, January, p. 167, 2012, WWW Document (http://www.dot.state.mn.us/research/TS/2012/2012-01.pdf)
3. M. A. Q. Adajar and M. A. H. Zarco, Int. J. GEOMATE, vol. 10, no. 3, pp. 1834–1841, (2016)
4. GEOTECHNICAL CHARACTERIZATION OF ALLUVIAL SOIL AS AN ALTERNATIVE ROADWAY CONSTRUCTION MATERIAL
5. E. E. S. Uy and M. A. Q. Adajar, Int. J. GEOMATE, vol. 12, no. 32, pp. 12–18,(2017)