american sociological association, 1963
Majalah, Jurnal, Buletin
The University od Chicago Press, 1980
Majalah, Jurnal, Buletin
Gillman, Peter, author
Aslib, 1984
Buku Teks
Krooss, Herman Edward, 1912-1975, author
Prentice-Hall, 1972
Buku Teks
Patrick, John
Macmillan Publishing Company, 1984
Buku Teks