Ham, F. Gerald
The Society of American Archivists , 1993
Buku Teks
Lindenberg, Stacy
American Society for Training & Development, 2012
eBooks
Ginsberg, Gerald L.
John Wiley & Sons, 1981
Buku Teks
Ginsberg, Gerald L.
John Wiley & Sons, 1981
Buku Teks
The British Council and the Publisher Association, 1992
Buku Referensi