Baradat, Leon P., author
[publisher not identified], [date of publication not identified]
Buku Teks
edited by Ronald Cohen and Elman R. Service
Institute for the Study of Human Issues, 1978
Buku Teks
Hommon, Robert J., author
Oxford University Press, 2016
Buku Teks
McDonald, Lee Cameron, author
Harcourt, Brace & World, 1968
Buku Teks
Fukuyama, Francis, author
Farrar, Straus and Giruox, 2012
Buku Teks