Thach, Elizabeth C., author
Effective distance learning: training techology
[American Society for Training & Development Press, American Society for Training & Development Press], 2001
 eBooks
Mehrotra, Chandra Mohan, author
Distance learning : principles for effective design, delivery, and evaluation
Sage Publications, 2001
 Buku Teks
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
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