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