Peters, B. Guy
CQ Press, , 2004
Buku Teks SO
Hird, John A.
Wadsworth , 2004
Buku Teks SO
Rose, Ernestine
Columbia University Press, 1954
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