London : St James Press, 1990,
Buku Referensi
Turabian, Kate L., author
University of Chicago Press, 1982
Buku Teks
Pugh, Derek S., author
Penguin Books, 1971
Buku Teks
Hope, A.D. (Alec Derwent), 1907-2000, author
Oxford University Press, 1992
Buku Teks
Buscemi, Santi V., author
McGraw-Hill , 2002
Buku Teks