Condition assessment of marine structure using functional condition index approach
 Artikel Jurnal
Population: challenging world crisis
edited by Bernard Berelson
Information Agency, 1975
 Buku Teks
Population : challenging world crisis
edited by Bernard Berelson
Voice of America, 1975
 Buku Teks
Han, Lintao
Miracles of life-challenging cancer
New World Press, 2009
 Buku Teks
Population : challenging world crisis
edited by Bernard Berelson
Voice of America, U.S. Information Agency, 1969
 Buku Teks SO