Jolly, Clifford J.
McGraw-Hill, 1995
Buku Teks
Nelson, Harry
West Publishing, 1988
Buku Teks
Montagu, Ashley, 1905-1999
Charles C. Thomas, 1960
Buku Teks
Jurmain, Robert
Wadsworth and Cengage Learning, 2013
Buku Teks SO
by Robert Jurmain, Harry Nelson, Lynn Kilgore, Wenda Trevathan
Wadsworth, 2001
Buku Teks SO