Ehrlich, Gertrude, author
PWS-Kentt Publishing, 1991
Buku Teks
Shields, Paul C., author
Worth Publishers, 1980
Buku Teks
Pillis, John de, author
Holt, Rinehart and Winston, 1969
Buku Teks
Lawson, Terry, author
John Wiley & Sons, 1996
Buku Teks
Anton, Howard, author
John Wiley & Sons, 1984
Buku Teks