Briggs, J. C.
Elsevier, 1987
Buku Teks
Humphries, Christopher J., author
Clarendon Press, 1986
Buku Teks
Oxford University Press, 1986
Buku Teks
edited by Ronald I. Miller
Chapman & Hall, 1994
Buku Teks
Taylor, Weldon Johnson, 1908-, author
South-Western Publishing, 1975
Buku Teks