Kyobo Book Centre, 2016
Buku Teks SO
Thackeray, W.M. (William Makepeace)
Everyman's Library, 1991
Buku Teks SO
Kyobo Book Centre, 2016
Multimedia
Leigh, Elyssebeth
The McGraw-Hill Companies Inc., 2001
Buku Teks
Thiagarajan, Sivasailam Thiagi
[American Society for Training & Development Press, American Society for Training & Development Press], 2001
eBooks