Warwick-Booth, Louise, author
Sage, 2013
Buku Teks SO
edited by Gerald D. Berreeman; with the assistance of Kathleen M. Zaretsky
Academic Press, 1981
Buku Teks
Shirahase, Sawako, editor
Routledge, 2013
eBooks
Matras, Judah
Prentice-Hall, 1975
Buku Teks
Sen, Amartya, 1933-, author
Harvard University Press , 1992
Buku Teks