Keating, Sarah B, author
Lippincott Williams & Wilkins, 2006
Buku Teks
Tobey, Deborah Davis, author
American Society for Training & Development, 2007
eBooks
Barbera, Elena, author
Information Science Reference, 2014
Buku Referensi
Hibbert, Kathryn M., editor
Springer, 2012
eBooks
Wolf, Richard M., author
Praeger, 1979
Buku Teks