edited by Charles W. Finkl, Jnr.
Van Nostrand Reinhold, 1984
Buku Referensi
edited by Carl K. Seyfert
Van Nostrand Reinhold, 1987
Buku Referensi
editor-in-chief Charles D. Spielberger
Hershey, 2004
Buku Teks
Skinner, Brian J., author
John Wiley & Sons, 1987
Buku Teks
Gilluly, James, author
W.H. Freeman, 1959
Buku Teks