McElroy, Mark W., author
Butterworth-Heinemann, 2003
Buku Teks
Innes, Judith E., author
Routledge, 2010
Buku Teks
Jurewicz, Lynn, author
[American Library association, American Library association], 2003
eBooks
Ramo, Simon
Hill and Wang, 1988
Buku Teks
Kadish, Jules E., author
Artech House , 1993
Buku Teks