Fouri, William M., author
Prentice-Hall, 1989
Buku Teks SO
Fuori, William M., author
Prentice-Hall, 1991
Buku Teks
Davis, Gordon B., author
McGraw-Hill, 1978
Buku Teks
O`Brien, James A., 1936-, author
Richard D. Iriwin, 1986
Buku Referensi
O`Brien, James A., 1936-, author
Richard D. Irwin, 1986
Buku Teks SO