Bird, Robert Byron, 1924-
John Wiley & Sons, 1964
Buku Teks SO
Bird, Robert Byron, 1924-
John Wiley & Sons, 1994
Buku Teks SO
Thomson, William J.
Prentice-Hall, 2000
Buku Teks SO
Donnelly, Daniel
Rockport Publishers, 1998
Buku Referensi
Fahien, Ray W.
McGraw-Hill, 1983
Buku Teks SO