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
Achua, Christopher F., author
Effective leadership
South Western Cengage Learning, 2013
 Buku Teks
Cook, Marshall J. ,author
Effective coaching
McGraw-Hill, 2011
 Buku Teks
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