McCarthy, Richard C.
[American Library association;American Library association, American Library association], 2007
eBooks
Walliman, Nicholas
Sage Publications Ltd , 2001
Buku Teks
Richman, Larry
[American Management Association, ], 2002
eBooks
Drago, Carl
Blackwell Publishing, 2007
Buku Referensi
Ziegler, Kathleen
Rockport Publishers, 1994
Buku Referensi