Peters, B. Guy
CQ Press, , 2004
Buku Teks SO
Hird, John A.
Wadsworth , 2004
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
Dye, Thomas R.
Pearson, 2014
Buku Teks
Gerston, Larry N.
Scott Foresman and Company, 1983
Buku Teks SO