edited by Philip M. Hauser and Otis Dudley Duncan
The University of Chicago Press, 1959
Buku Teks
Goldscheider, Calvin, author
Litle Brown, 1971
Buku Teks
Woytinsky, W.S.
The Twentieth Century Fund, 1953
Buku Teks
Peters, Gary L., author
Kendall/Hunt, 1983
Buku Teks
Bouvier, Leon F., author
Seven Lucks Press, 1999
Buku Teks