Best, John B., author
West Publishing, 1989
Buku Teks
Turner, Johanna, author
Methuen, 1975
Buku Teks
Nolledo, Jose N.
National Book Store, 1967
Buku Teks
Nolledo, Jose N.
National Book Store, 1967
Buku Teks
Queljoe, David H de
Illinois Norhern Illinois University 1971
Buku Teks