Hart, B.H. Liddell
Frederick A. Praeger, 1961-1965
Buku Teks SO
by David Besanko [and others]
John Wiley & Sons, 2004
Buku Teks
Ferrell, O.C.
Thomson South-Western, 2008
Buku Teks SO
Stillman, Richard N.
Holt, Rinehart and Wilson, 1962
Buku Teks
Besanko, David
John Wiley & Sons, 1996
Buku Teks