Cammack, Paul Anthony, author
Macmillan, 1993
Buku Teks
Bailey, Stephen K., author
Henry Holt, 1957
Buku Teks
OConnor, Karen, author
Addison Wesley Longman, 2001
Buku Teks
Gooch, R.K. (Robert Kent), 1893-1982, author
D. Van Nostrad, 1937
Buku Teks
Stout, Hiram Miller, author
Oxford University Press, 1953
Buku Teks