Hamburg, Morris, author
Harcourt Brace Jovanovich, Pub., 1991
Buku Teks
Zimmerman, Jerold L., 1947-, author
McGraw-Hill, 1997
Buku Teks
Melman, Seymour, author
Oxford, Basil Blacwell & Mott
Buku Teks
Zeleny, Milan, 1942-, author
McGraw-Hill, 1982
Buku Teks
O`Sullivan, Terence, author
Macmillan, 1999
Buku Teks