Weber, Larry, author
John Wiley & Sons Inc., 2009
Buku Teks
Hanani Faiza, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Skripsi (Membership)
Macy, Beverly, author
McGraw-Hill, 2011
Buku Teks
Hartley, Darin, author
American Society for Training & Development, 2010
eBooks
Nuriyah Syakiela, author
2018
UI - Skripsi (Membership)