Craig, Roy R., 1934-, author
John Wiley & Sons, 1981
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Meek, John L., author
E and FN Spon, 1991
Buku Teks
Jenkins, W.M., author
McGraw-Hill, 1969
Buku Teks SO
Dept. of Civil Engineering, Vanderbilt University, 1975
Buku Teks
Kovach, Ladis D., author
Holden-Day, 1984
Buku Teks SO