Leahey, Thomas Hardy, author
Prentice-Hall, 1997
Buku Teks
Mason, Stephen S., author
Henry Schuman, 1953
Buku Teks
Aron, Raymond, author
Basic Books, 1965
Buku Teks
Gabriel, Ralph Henry, 1890-1987, author
D. Appleton-Century, 1942
Buku Teks
Trigger, Bruce G., author
Cambridge University Press, 2006
Buku Teks