Garn, Stanley M.
Charles C. Thomas, 1971
Buku Teks
Sharma, I.C.
Neb. Johnsen , 1965
Buku Teks
Walas, Stanley M., author
Butterworth-Heinemann, 1990
Buku Teks
Ulanoff, Stanley M.
Hastings House , 1977
Buku Teks
Farwel, Byron
Henry Holt and Co, 1957
Buku Teks