Earle, James H.
Addison-Wesley, 1994
Buku Teks SO
Cox, N. J. (Nicholas J
Texas Stata Press, 2014
Buku Teks
by Edwin T. Boyer ... [and others]
John Wiley & Sons, 1991
Buku Teks SO
Lueptow, Richard M.
Prentice-Hall, 2001
Buku Teks SO
by Arvid R. Eide ... [and others]
McGraw-Hill, 1985
Buku Teks SO