Tambunan, Emil H., author
Kepribadian Seutuhnya : terobosan mencapai hidup berdaya guna dan sukses
Indonesia Publishing House, 2007
 Buku Teks
Schuller, Robert H., author
Keuletan kunci keberhasilan : masa yang sulit tidak pernah berakhir, tetapi orang yang ulet akan berhasil mengatasinya
Gunung Mulia, 1986
 Buku Teks
Canterucci, Jim, author
Personal brilliance: mastering the everyday habits that create a lifetime of success
American Management Association;, 2005
 eBooks
Tingley, Judith C., author
Say what you mean get what you want: a businessperson's guide to direct communication
American Management Association;;, 1996
 eBooks
Scott, Kim, author
Radical candor : how to get what you want by saying what you mean
Pan Books, 2019
 Buku Teks
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