Zaalberg, C.A., author
Malmberg den Bosch, 1973
Buku Teks
Fairbanks, Deborah M., author
[American Society for Training and Development Press, American Society for Training and Development Press], 2000
eBooks
Saussure, Ferdinand de, author
Peter Owen, 1960
Buku Teks
Vos, Bart
Nijgh & Van Ditmar, 1992
Buku Teks
Vos H. de
Bayu Indra Grafika, 1987
Buku Teks