New York : Macmillan, 1993,
Buku Referensi
editors in chief, Sybil P. Parker, Robert A. Corbitt
McGraw-Hill, 1993
Buku Referensi
Frederic, Louis
Belknap Press, 2002
Buku Referensi
editor, Donald M. Borchert
Macmilan, 1996
Buku Referensi
edited by Raymond J. Corsini
New York : John Wiley & Sons, 1990,
Buku Referensi