Wallace, Harold R.
Personality development for work / Harold R. Wallace and L. Ann Masters
South-Western Educational, 1995
 Buku Teks SO
Strommen, Ellen A.
Developmental psychology
Dorsey Press, 1983
 Buku Teks SO
Voices of modern psychology
Addison Wesley Publishing Company, 0
 Buku Teks
Lykins, Lorrie
Better, smarter, faster: how Web 3.0 will transform learning in high-performing organizations
American Society for Training & Development, 2011
 eBooks
Stine, Jean Marie
Mengoptimalkan daya pikir: meningkatkan daya ingat dengan mengerahkan seluruh kemampuan otak = Double your brain power
Pustaka Delapratasa, 2001
 Buku Teks