Dasgupta, C., author
Sage, 2002
Buku Teks
Delhi : Publications Dividision
Majalah, Jurnal, Buletin
Fox, Annette Baker, 1912-, author
The University of Chicago Press, 1959
Buku Teks
Cattell, David T.
University of California Press, 1957
Buku Teks
Buss, Claude Albert, author
Macmillan, 1941
Buku Teks