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