Kane, Laura Townsend
American Library association, 2003
eBooks
Morgan, Scott
Cambridge University Press, 2006
Buku Teks
Newlen, Robert R.
Neal-Schuman Publishers, 2006
Buku Teks
Jansen, Ritsert C.
Cambridge University Press, 2013
Buku Teks
University of Chicago Press, 1970
Buku Referensi