Stuyck, Raymond
Brito, 1972
Buku Teks
Kotter, John P., 1947-, author
1998, 1998
Buku Teks
Stryker, Perrin, editor
Harper & Row, [date of publication not identified]
Buku Teks
Maddux, Robert B., author
Erlangga, 2001
Buku Teks
Burger, Chester, author
Macmillan, 1964
Buku Teks