Birkets, Sven P
Allyn and Bacon, 1993
Buku Teks
edited by Ralph Cohen
Johns Hopkins University Press, 1974
Buku Teks
edited by Ralph Cohen
Sheridan Press, 1989
Buku Referensi
Crane, R.S., author
University of Chicago Press, 1971
Buku Teks
Krieger, Murray
The Johns Hopkins University Press, 1976
Buku Teks