Endah Nawang Novianti, translator
Alex Media Komputindo, 2014
Buku Teks
Artikel Jurnal
Pittman, Al
Breakwater Books Limited, 1978
Buku Teks
Guaspari, John, author
American Society for Training & Development, 1985
eBooks
Soewito Santoso
Institute of Southeast Asian Studies, 1980
Buku Teks