(1998). U.N. predicts world population to settle at 11 billion by 2000. Manila Bulletin.
Chicago Style aipamena"U.N. Predicts World Population to Settle at 11 Billion by 2000." Manila Bulletin 1998.
MLA aipamena"U.N. Predicts World Population to Settle at 11 Billion by 2000." Manila Bulletin, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.