Kennedy, Walter, author
Bankers Publishing Company , 1958
Buku Teks
Koch, Timothy W., author
The Dryden Press, 2000
Buku Teks
Veithzal Rivai Zainal, author
Radja Grafindo Persada, 2007
Buku Teks
Warman Djohan
Mutiara Sumber Widya, 2000
Buku Teks
Ade Arthesa, author
Indeks, 2006
Buku Teks