(1998). U.N. predicts world population to settle at 11 billion by 2000. Manila Bulletin.
Cita Chicago (17th ed.)"U.N. Predicts World Population to Settle at 11 Billion by 2000." Manila Bulletin 1998.
Cita MLA (9th ed.)"U.N. Predicts World Population to Settle at 11 Billion by 2000." Manila Bulletin, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.