Adelman, Irma
Stanford University Press, 1961
Buku Teks
Hutchinson, E.P.
Houghton Mifflin, 1967
Buku Teks
Link, Robert G.
Columbia University Press, 1959
Buku Teks
Beard, Charles A.
Macmillan, 1957
Buku Teks
Beard, Charles A.
Free Press, 1986
Buku Teks