Vasta, Ross, author
John Wiley & Sons, 1999
Buku Teks
Goldschlager, Les, author
Prentice-Hall, 1982
Buku Teks
Carin, Arthur A., author
Charles E. Merrill, 1985
Buku Teks
edited by R.C. Olby, G.N. Cantor, J.R.R. Christie and M.J.S. Hodge
Routledge, 1990
Buku Referensi
0, 0
Buku Teks