Battell, Chris, author
Effective listening: business skills
American Society for Training & Development, 2006
 eBooks
Downs, Lisa J., author
Listening skills training
American Society for Training & Development, 2008
 eBooks
Scott, John, author
Effective management skills : what is a manager?
Spere British Institute of Management, 1984
 Buku Teks
Ellis, Carol W., author
Management skills for new managers
[American Management Association, ], 2005
 eBooks
Munter, Mary, author
Guide to managerial communication: effective business writing and speaking
Prentice-Hall, 1982
 Buku Referensi
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