Ambrose, Stephen E., author
The Johns Hopkins University Press, 1999
Buku Teks
Clyde, Paul H. (Paul Hibbert), author
Prentice-Hall, [date of publication not identified]
Buku Teks
edited by Geoffrey Parker
Cambridge University Press, 1995
Buku Referensi
Clyde, Paul Hibbert, author
Prentice-Hall, 1960
Buku Teks
Webster, J.B., author
Frederick A. Praeger, 1967
Buku Teks