Marianne Wait, editor
Reader's Digest, 2007
Buku Teks
edited by Serpil Sahin
CRC Press, 2009
Buku Teks
edited by F.S. Thatcher, D.S. Clark
University of Toronto Press, 1968
Buku Teks
Jacobs, Morris B., author
Van Nostrand Reinhold, 1962
Buku Teks
Artikel Jurnal