Lambert, Stephen E.
VGM Career Horizons Illinois: VGM Career Horizon, 1999, 1998
Buku Teks
Wood, Leigh N., author
[Springer, Springer], 2012
eBooks
Sacks, Terrence J.
VGM Career Harizons , 1993
Buku Teks
Artikel Jurnal
Austin, Michael J.
Human Science Press, 1978
Buku Teks