Forsythe, David P., 1941-
University of Nebraska Press, 1983
Buku Teks
Delaet, Debra L., 1968-
Cengage Learning, 2015
Buku Teks
Mayer, Ann Elizabeth
Westview Press, 1995
Buku Teks
Delaet, Debra L., 1968-
Thomson Wadsworth, 2006
Buku Teks
Steiner, Henry J.
Oxford University Press, 2000
Buku Teks