Petersen, William, author
Population
Macmillan, 1969
 Buku Teks
Petersen, William, author
Population
Macmillan, 1969
 Buku Teks
Sheng, Lijun, author
China's dilemma : the Taiwan issue
Institute of Southeast Asian Studies, 2001
 Buku Teks
The dilemma of food in Africa
 Artikel Jurnal
Emmerson, John K., author
Arms, Yen and power: the Japanese dilemma
Charles E. Tuttle Company, 1976
 Buku Teks
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