Webber, Ross A.
Van Nostrand Reinhold, 1972
Buku Teks SO
Mancini, Marc
McGraw-Hill, 2003
Buku Teks SO
UNDP and ESCAP , 1987
Buku Teks SO
Shackelford, Bill
American Society for Training and Development Press;, 2004
eBooks
edited by M.D. Jitendra
Anmol Publications, 1999
Buku Referensi