Heidingsfield, Myron S.
Mass Allyn and Bacon , 1968
Buku Teks
Holloway, Robert J., author
John Wiley & Sons, 1968
Buku Teks
Wales, Hugh G.
The University of Illinois Press , 1951
Buku Teks
Christian Soetanto. author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Tesis Membership
Kelley, Eugene J.
Prentice-Hall, 1965
Buku Teks