Borich, Gary D., author
Prentice-Hall, [date of publication not identified]
Buku Teks
Wilson, John A. R., author
McGraw-Hill, 1974
Buku Teks
Artikel Jurnal
Sullivan, Peter, 1948-, author
Springer, 2013
Buku Teks
Kathleen M. Cauley, editor
Dushkin, 2000
Buku Teks