Dahl, Robert A., 1915-2014, author
Ballantine Books, 1970
Buku Teks
Kaczmarczyk, Lisa C., author
CRC Press, 2012
Buku Teks
Artikel Jurnal
Editor by Arnold Hirshon
American Library Association, 1993
Buku Teks
Brady, Robert A, author
University of California Press , 1963
Buku Teks