Jones, John G., author
Alexander Hamilton Institute, 1961
Buku Teks
Ohai, Tim, author
American Society for Training & Development, 2008
eBooks
Stanton, William J., author
Richard D. Irwin, 1978
Buku Teks
Stanton, William J., author
Richard D. Irwin, 1964
Buku Teks
Shapiro, Benson P., author
McGraw-Hill, 1977
Buku Teks