Litton, Roger A., 1944-, author
Crime and crime prevention for insurance practice
Avebury, 1990
 Buku Teks
Dwyer, Susan
The problem of pornography
Wodsworth Publishing Company, 1995
 Buku Teks
The population problem
edited by Stanley Johnson
John Wiley & Sons, 1973
 Buku Teks
Easton, Susan M., author
The problem of pornography
Routledge, [date of publication not identified]
 Buku Teks
Russel, Bertrand, author
The problem of China
George Allen and Unwin, 1922
 Buku Teks
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