1995
Buku Teks
Folsom, Ralph Haughwout, author
[publisher not identified], 2000
Buku Teks
Folsom, Ralph Haughwout, author
South-Western Publishing, 1996
Buku Teks
Folsom, Ralph Haughwout, author
[publisher not identified], [date of publication not identified]
Buku Teks
Sornarajah, M, author
Cambridge University Press, 2017
Buku Teks