Schwartz, Urs, author
Doubleday, 1966
Buku Teks
edited by Donald M. Allen
Grove Press, 1960
Buku Teks
Graber, Mark A., author
Oxford University Press, 2015
Buku Teks
Chapman, Robert L., author
London Pan Books 1988
Buku Referensi
Hughes, Charles W., author
Columbia University Press, 1980
Buku Referensi