Quadagno, Jill S., author
St. Martin's Press, 1980
Buku Teks
Li, Ju-Chen, author
P. Owen , [1965]
Buku Teks
Morgan, Charles, author
Macmillan, 1946
Buku Teks
K. Warner Schaie, Sherry L. Willis, editor ; Bob G. Knight, Becca Levy, Denise C. Park, associate editors
Elsevier, 2011
Buku Teks
Joppke, Christian, author
Polity Press, 2009
Buku Teks