Gerber, Philip L., author
Effective english
Random House, 1959
 Buku Teks
Achua, Christopher F., author
Effective leadership
South Western Cengage Learning, 2013
 Buku Teks
Cook, Marshall J. ,author
Effective coaching
McGraw-Hill, 2011
 Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
The effective executive
Harper & Row, 1996
 Buku Teks
Moore, Robert Hamilton, author
Effective writing
Holt, Rinehart and Winston, 1959
 Buku Teks
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