Durrance, Joan C.
[American Library association, ], 2005
eBooks
Morley, Michael
Palgrave, 2002
Buku Teks
Gates, Jean Key
McGraw-Hill, 1974
Buku Referensi
White, Jon
Business Book Limited, 1991
Buku Referensi
Salacuse, Jeswald W.
American Management Association;, 2006
eBooks