Klenk, Robert W.
Wadsworth, 1974
Buku Teks
Klenk, Robert W
Wadsworth, 1970
Buku Teks
Edited by Cindy Coleman
McGraw-Hill, 2002
Buku Referensi
Clemen-Stone, Susan, author
Mosby, 1998
Buku Teks
Hardina, Donna, author
Columbia University Press, 2002
Buku Teks