Roman, Kenneth
St. Martin's Press , 1976
Buku Teks
Sutherland, Max, author
Allen and Unwin, 2000
Buku Teks
White, Roderick, author
McGraw-Hill, 1980
Buku Teks
White, Roderick, author
McGraw-Hill, 1993
Buku Teks
Hofsoos, Emil
Gulf Publishing Company, 1970
Buku Teks