Federal Republic of Germany, 1977
Buku Teks
edited by G.L. Wood
Macmillan, 1954
Buku Teks
National Academy of Sciences , 1976
Buku Teks
Thomas, Susan J., author
[American Society for Training and Development Press;, ], 2004
eBooks
Barrow, Christopher J., author
Essex Longman Scientific & Technical, 1987
Buku Teks