John Wiley & Sons, 1964
Buku Teks
Sturdivant, Frederick D., author
Richard D. Irwin, 1977
Buku Teks
O`Brien, James A., 1936-, author
McGraw-Hill, 2003
Buku Teks
Madura, Jeff, author
South-Western College, 2001
Buku Teks
Straub, Joseph T., author
Kent, 1985
Buku Teks