Charnley, Mitchell V., author
Holt, Rinehart and Wisnton, 1965
Buku Teks
Danilov, Victor J. author
Macmillan, 1955
Buku Teks
Ahuja, B. N., author
Surjeet Publications, 1990
Buku Teks
Nainggolan, Juleoria, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2009
UI - Tesis (Open)
Fred Fedler ... [and others]
Fort Worth Harcourt Brace College , 1997
Buku Teks