Bedworth, David D., author
John Wiley & Sons, 1987
Buku Teks
Bedworth, David D., author
John Wiley & Sons, 1987
Buku Teks
Rago, Louis J.
Scranton: International, 1963
Buku Teks
Rage, Louis J., author
Scranton, Penn., International Textbook
Buku Teks
Hodges, David A., author
McGraw-Hill, 1983
Buku Teks