Mason, Stephen S.
Henry Schuman, 1953
Buku Teks
Aron, Raymond
Basic Books, 1965
Buku Teks
Gabriel, Ralph Henry, 1890-1987
D. Appleton-Century, 1942
Buku Teks
Trigger, Bruce G.
Cambridge University Press, 2006
Buku Teks
edited by Isaac Kramnick
[publisher not identified], 1969
Buku Teks