Quint, Howard H
Dorsey Press, 1968
Buku Teks
Muccigrosso, author
Krieger publishing company, 2001
Buku Teks
VanSpanckeren, Kathryn, author
Lembaga Penerangan Amerika Serikat, 2001
Buku Teks
Gray, Richard, 1944-, author
John Wiley & Sons, 2015
Buku Teks
edited by Robert Clayton Pierce
Thomson Learning, 2001
Buku Teks