Artikel Jurnal
Durrance, Joan C.
[American Library association, ], 2002
eBooks
Elliott, Donald S.
[American Library association, American Library association], 2007
eBooks
Markless, Sharon
Facet Publishing, 2006
Buku Teks
Katz, William A., 1924-
Holt, Rinehart and Winston, 1979
Buku Teks