edited by Marvin J. Weber
CRC Press, 1995
Buku Referensi
edited by Oksana Ostroverkhova
Woodhead, 2013
eBooks
edted by Joseph S. Roucek
Greenwood Press , 1978
Buku Teks
edited by David A. Preston
John Wiley & Sons, 1980
Buku Teks
compiled by Jenney Morgan
Routledge , 1996
Buku Referensi