Davidsen, Susanna, author
[American Library association, American Library association], 2004
eBooks
Microsoft Corporation, 1999
Multimedia
Drago, Carl, author
Blackwell Publishing, 2007
Buku Referensi
Ziegler, Kathleen, author
Rockport Publishers, 1994
Buku Referensi
Drago, Carl, author
Blackwell, 2014
Buku Teks