Budhu, Muni
Foundations and earth retaining structures
John Wiley & Sons, 2008
 Buku Teks SO
Evaluating federal systems
edited by Bertus De Villiers
Martinus Nijhoff, 1994
 Buku Teks SO
Hidore, John J.
Physical geography : earth systems
Scott, Foresman, 1974
 Buku Teks SO
Bloom, Martin
Evaluating practice : guidelines for the accountable professional / Martin Bloom, Joel Fische
Prentince-Hall, 1982
 Buku Teks
Tschebotarioff, Gregory P.
Foundations, retaining and earth structures : the arts of design and construction and its scientific basis in soil mechanics
McGraw-Hill, 1973
 Buku Teks