Meade, Richard A.
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.
Effective leadership
South Western Cengage Learning, 2013
Buku Teks
Cook, Marshall J. ,author
Effective coaching
McGraw-Hill, 2011
Buku Teks
Drucker, Peter Ferdinand, 1909-2005
The effective executive
Harper & Row, 1996
Buku Teks