Gerber, Philip L., author
Effective english
Random House, 1959
 Buku Teks
Meade, Richard A., author
Effective English: workbook 3 and 4
Belmont, 1964
 Buku Teks
A creative partnership and an innovative and effective multimedia english language learning and teaching website
 Artikel Jurnal
Drucker, Peter Ferdinand, 1909-2005, author
The effective executive
Harper & Row, 1996
 Buku Teks
Achua, Christopher F., author
Effective leadership
South Western Cengage Learning, 2013
 Buku Teks
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