Danni Junus
Gagas Media, 2004
Buku Teks
Lim, Yong Joo
Korea Seoul Daewonsa, 2006
Buku Teks
Kim, Hei-kyung
Gyonggi-do: Yeol Hwa Dan, 2005
Buku Teks
McDermott, Lynda Caryl
American Society for Training and Development, 2008
eBooks
Jeong, In-hyeong
Munhakkwajiseongsa, 2012
Buku Teks