Pitman, Lesley, author
Elsevier, 2015
Buku Teks
Artikel Jurnal
Kohn, Karen C., 1978, author
Rowman & Littlefield, 2015
Buku Teks
edited by Antonio P. DeRosa
Chandos Publishing, 2018
Buku Teks
Nisonger, Thomas E., author
Libraries Unlimited, 1992
Buku Referensi