Reynolds, Lloyd G., author
Prentice-Hall, 1982
Buku Teks
edited by Wilhelm Danca
Council for Research in Values and Philosophy, 2008
Buku Teks
Murphy, Jefrie G., author
D. Reidel Publishing Company, 1979
Buku Teks
Cherlin, Andrew J., author
McGraw-Hill, 2002
Buku Teks
Schultze, Charles L., author
The Brookings Institution, 1977
Buku Teks