Slonim, Marc, author
Collier Books, 1962
Buku Teks
Zenger, John H., author
McGraw-Hill, 2004
Buku Referensi
Barnes, John A., author
American Management Association, 2005
eBooks
Swartz, Greg, author
American Society for Training & Development, 2008
eBooks
Edmondson, Amy C., author
Emerald, 2017
eBooks