Manley, John F.
Macmillan, 1976
Buku Teks
Clarke E. Cochran, Lawrence C. Mayer, T.R. Carr, N. Joseph Cayer, Mark J. McKenzie, Laura R. Peck
USA Cengage Learning, 2016
Buku Teks
Hird, John A.
Wadsworth , 2004
Buku Teks
Bromley, Daniel W., 1940-
Basil Blackwell, 1989
Buku Teks
Hague, D.C.
Macmillan, 1975
Buku Teks