Nicolson, Paula, author
MacMillan Education, 1986
Buku Teks
Gilmer, B. von Haller (Beverly von Haller), 1909-1994, author
McGraw-Hill, 1967
Buku Teks
editor-in-chief Charles D. Spielberger
Hershey, 2004
Buku Teks
Biehler, Robert F.
Houghton Miffiln, [date of publication not identified]
Buku Teks
Blum, Milton L., author
Harper & Row, 1968
Buku Teks