Dallin, Leon
WM. C. Brown Co. Pub., 1965
Buku Teks
Falletta, Salvatore V., author
[American Society for Training & Development;, ], 2001
eBooks
McGraw-Hill, 1981
Buku Teks
Posey, Imogene A.
Harcourt Brace Jovanovich, 1990
Buku Teks
Poulter, Alan, author
Library Association Publishing, 2000
Buku Referensi