editor, Roger L. Brockenbrough, Frederick S. Maerritt
McGraw-Hill, 1994
Buku Referensi
Gorenc, B. (Branko)
UNSW Press, 1981
Buku Referensi
Salmon, Charles G.
Harper and Row, 1980
Buku Referensi
edited by Roger L. Brockenbrough, Frederick S. Merrit
McGraw-Hill, 1999
Buku Referensi
Ambrose, James E.
John Wiley & Sons, 1997
Buku Teks SO