Conway, Richard
Massachusetts Winthrop Publishers, 1975
Buku Teks
Conway, Richard
Winthrop Publishers, 1973
Buku Teks
Edwards, Leonard E.
Reston Publishing, 1973
Buku Teks
Katzan, Harry, Jr.
Auerbach, 1972
Buku Teks
Brown, Martin C.
Osborne/McGraw-Hill, 1999
Buku Referensi