British Library, 1984
Buku Referensi
Chmara, Theresa, author
[American Management Association, ], 2009
eBooks
Rashelle S. Karp, editor
[American Library association, American Library association], 2002
eBooks
Kohn, Karen C., 1978, author
Rowman & Littlefield, 2015
Buku Teks
Pitman, Lesley, author
Elsevier, 2015
Buku Teks