Prentice-Hall, 1965.
Buku Teks
Miller, John C.
Stanford University Press, 1965
Buku Teks
Langguth, A.J
Simon and Schuster, 1988
Buku Teks
Moniz, Amanda B., author
Oxford University Press, 2016
eBooks
Becker, Carl L. (Carl Lotus), 1873-1945, author
Silver Burdett, 1944
Buku Teks