Linsenman, Ciree
Ep. Entrepreneur Press, 2011
Buku Teks
Entrepreneur Press, Ciree Linsenman
Entepreneur Press, 2011
Buku Teks
Skrob, Robert
Entrepeneur Press, 2013
Buku Teks
Phillips, Patricia Pulliam
American Society for Training & Development, 2012
eBooks
McCarthy, Richard C.
[American Library association;American Library association, American Library association], 2007
eBooks