Nehr, Lee Charles, author
International Textbook, 1967
Buku Teks
Nehr, Lee Charles, author
Intext Educational, 1972
Buku Teks
Block, Stanley B., author
Canfield Press, 1973
Buku Teks
Sirmans, C. F., author
McGraw-Hill , 1985
Buku Teks
Nelson, Grant S., author
West Publishing, 1992
Buku Teks