Allen, T.F.H., author
University of Chicago Press, 1988
Buku Teks
Baerman, Matthew, author
Cambridge University Press, 2017
Buku Teks
edited by Mike Hinchey, Lorcan Coyle
Springer, 2012
eBooks
Savage, John E., author
John Wiley & Sons, 1976
Buku Teks
Krebs, Charles J., author
Harper Collins, 1989
Buku Teks