Hodges, John C.
Harcourt Brace Jovanovich, 1972
Buku Teks
Schorer, Mark
Harcourt, Brace Jovanovich, 1972
Buku Teks
Graham, Sheila Y.
Harcourt Brace Jovanovich , 1972
Buku Teks
Marius, Richard
McGraw-Hill, 1988
Buku Teks
Heffernan, James A.W.
W.W. Norton & Company, 1986
Buku Referensi