edited by Carl K. Seyfert
Van Nostrand Reinhold, 1987
Buku Referensi
editor-in-chief Charles D. Spielberger
Hershey, 2004
Buku Teks
Skinner, Brian J.
John Wiley & Sons, 1987
Buku Teks
Gilluly, James
W.H. Freeman, 1959
Buku Teks
Billings, Marland P.
Prentice-Hall, 1954
Buku Teks