Lapin, Lawrence L., author
Harcourt Brace Jovanovich, 1990
Buku Teks
Taylor, Peter J., author
Glorier International, 1999
Buku Referensi
Surma, Jerzy, author
Businessexpert Press, 2011
Buku Teks
S. Prajudi Atmosudirdjo, author
Ghalia Indonesia, 1982
Buku Teks
Cundiff, Edward W., author
Prentice-Hall, 1964
Buku Teks