Religion
Korean Overseas Information Service, 1978
 Buku Teks SO
Naisbitt, John
Global paradox
Avon Books, 1994
 Buku Teks SO
Naisbitt, John
Global paradox
Avon Books, 1994
 Buku Teks SO
Shipka, Thomas A.
Philosophy: paradox and discovery
McGraw-Hill, 1996
 Buku Teks SO
The economics of poverty : an American paradox
edited by Burton A. Weisbrod
Prentice-Hall, 1965
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