Neal, Bruno, author
American Society for Training & Development, 2012
eBooks
Emden, Cecil S.
At The Clarendon Press, 1956
Buku Teks
Knudson, Harry R.
McGraw-Hill Kogakusha, 1979
Buku Teks
Ashabranner, Brent K.
Hougton Mifflin Company, 1961
Buku Teks
Ashabranner, Brent K.
The Riverside Press, 1961
Buku Teks