Kirkpatrick, C.A.
Houghton Miffiln, 1959
Buku Teks
Smith, George Horsley
McGraw-Hill, 1954
Buku Teks
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1991
UI - Skripsi (Membership)
Jefkins, Frank William
MacMillan Publishers, 1985
Buku Teks
Dunn, S. Watson
Buku Teks