Rangkuti, Freddy, author
Elex Media Komputindo, 2002
Buku Teks
Howard, John A., author
Richard D. Irwin, 1957
Buku Teks
Howard, John A., author
Richard D. Irwin, 1962
Buku Teks
Kurtz, David L., author
The Dryden Press , 1981
Buku Teks
Alex Soemadji Nitisemito, author
Ghalia Indonesia, 1984
Buku Teks