James C. Kaufman, author
Cambridge University Press, 2009
eBooks
Freeman, Frank S.
Holt, Rinehart and Winston, 1960
Buku Teks
Richterich, Rene, author
John Wiley & Sons, 1978
Buku Teks
edited by Jerrold R. Brandell
Free Press, 1997
Buku Teks
W.B. Saunders , 1989
Buku Teks