Ridge, Warren J., author
Illinois Dow Jones-Irwin , 1973
Buku Teks
Febriola Wijaya, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2017
UI - Tesis (Membership)
Penguin Education, 1973
Buku Teks
Middlesex Penguin Books, 1971
Buku Teks
Block, Stanley B.
Irwin, 1994
Buku Teks