edited and selected by Benjamin Nelson
George Allen and Unwin, 1958
Buku Teks
edited by Michael P. Levine
Routledge Press, 2000
Buku Teks
Hollitscher, Walter
Routledge & Kegan Paul, 1950
Buku Teks
Jacobs, Michael
Sage Publications, 2003
Buku Teks
Heller, Sharon
John Wiley & Sons, 2005
Buku Teks