editors, Dianne C. Longo, Reg Arthur Williams
Appleton-Century-Crofts, 1978
Buku Teks
Huberty, Thomas J., author
Springer, 2012
eBooks
Thomlison, Barbara, author
Brooks/Cole Thomson Learning, 2002
Buku Teks
Myer, Rick A.
Brooks/Cole, 2000
Buku Teks
Williams, Frederich
Wadworth , 1987
Buku Teks