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
Reckless, Walter
The Crime problem
 Buku Teks
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