Harper & Row , 1971
Buku Teks
Wilson, John A. R., author
McGraw-Hill, 1974
Buku Teks
Woolfolk, Anita E., author
Allyn and Bacon , 1995
Buku Teks
De Cecco, John P.
Prentice-Hall, 1974
Buku Teks
Hoy, Anita Woolfolk, 1947-, author
Allyn and Bacon, 2004
Buku Teks