Effective listening: business skills
 eBooks
Scott, John
Effective management skills : what is a manager?
Spere British Institute of Management, 1984
 Buku Teks
Foster, John
Effective writing skills for public relations
Crest Publishing House, 2003
 Buku Teks
Atwood, Christee Gabour
Ultimate basic business skills: training an effective workforce
American Society for Training & Development, 2009
 eBooks
Richards, Jack C.
Strategic reading 2 : building effective reading skills
Cambridge University Press, 2009
 Buku Teks