Turney, Tully H.
Mosby, 1973
Buku Teks
Simpson, George Gaylord
Harcourt Brace & World, 1969
Buku Teks
Murray, Patrick Desmond Fitzgerald
Macmillan, 1961
Buku Teks
Bailey, Paul C.
International Textbook Company, 1969
Buku Teks SO
Volpe, E. Peter (Erminio Peter)
W.C. Brown, 1975
Buku Teks