Rosenblatt, Joe, author
Top soil
Press Porcepic, 1976
 Buku Teks
Elliott, Osborn, author
Men at the top
Harper & Brothers , 1959
 Buku Teks
Ziglar, Zig, author
Steps to the top
Heinemann Asia, 1995
 Buku Teks
Sulman, Elizabeth, author
Introduction to soil
Prentice-Hall, 1999
 Buku Teks
Craig, R.F. (Robert F.), author
Soil mechanics
Van Nostrand Rheinhold, 1974
 Buku Teks
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