Barnes, Harry Elmer
The University of Chicago Press, 1948
Buku Teks
edited by Harry Elmer Barnes
The University of Chicago Press, 1958
Buku Teks
Cambridge University Press, 2017
eBooks
Calhoun, Craig J.
McGraw-Hill , 1994
Buku Teks
Farley, John E.
Prentice-Hall, 1992
Buku Teks