APA (7e ed.) Bronvermelding

Immerwahr, G. (1981). Contraceptive use in Sri Lanka. International Statistical Institute ; World Fertility Survey.

Chicago (17e ed.) Bronvermelding

Immerwahr, George. Contraceptive Use in Sri Lanka. Voorburg, Netherlands : London: International Statistical Institute ; World Fertility Survey, 1981.

MLA (8e ed.) Bronvermelding

Immerwahr, George. Contraceptive Use in Sri Lanka. International Statistical Institute ; World Fertility Survey, 1981.