Hasegawa, Noriyoshi, author
Page one publishing pte ltd, 2010
Buku Teks
Porter, Lindsay, author
Porter Publishing, 1995
Buku Referensi
Fogel, Efi, author
Springer, 2012
eBooks
Phillips, Patricia Pulliam, author
American Society for Training & Development, 2012
eBooks
Davidsen, Susanna, author
[American Library association, American Library association], 2004
eBooks