APA (7th ed.) Citation

Engelman, R. (1997). Why population matters?: 1996. Population Action International.

Chicago Style (17th ed.) Citation

Engelman, Ralph. Why Population Matters?: 1996. Washington: Population Action International, 1997.

MLA (9th ed.) Citation

Engelman, Ralph. Why Population Matters?: 1996. Population Action International, 1997.

Warning: These citations may not always be 100% accurate.