APA (7th ed.) Citation

Sadik, N. (1999). State of world population 1999: 6 billion : a time for choices. United Nations Population Fund.

Chicago Style (17th ed.) Citation

Sadik, Nafis. State of World Population 1999: 6 Billion : A Time for Choices. New York: United Nations Population Fund, 1999.

MLA (9th ed.) Citation

Sadik, Nafis. State of World Population 1999: 6 Billion : A Time for Choices. United Nations Population Fund, 1999.