Innes, Judith E., author
Routledge, 2010
Buku Teks
Jones, Charles O.
Brooksm, 1977
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
Webster, Donald H., author
Harper & Row , 1958
Buku Teks
Stopher, Peter R.
Edward Elgar Publishing Limited, 2016
Buku Teks