Starr, Martin K., author
McGraw-Hill , 1977
Buku Teks
Hull, John F., author
Gower Press, 1973
Buku Teks
Rage, Louis J., author
Scranton, Penn., International Textbook
Buku Teks
Eilon, Samuel, author
Macmillan, 1962
Buku Teks
British Institute of Management , 1951
Buku Teks