Bradford, Richard, 1957-
Routledge, 2001
Buku Teks
Heffernan, James A.W.
W.W. Norton & Company, 1986
Buku Teks
edited by W.A. Paton
Ronald Press, 1955
Buku Teks
editor, Harry Helms [and others]
McGraw-Hill, 1983
Buku Referensi
William J. Hardcastle, John Laver, Fiona E. Gibbon, editor
Wiley-Blackweell, 2013
Buku Teks