World Fertility Survey. (1980). The Guyana fertility survey, 1975: A summary of findings. International Statistical Institute ; World Fertility Survey.
Chicago-referens (17:e uppl.)World Fertility Survey. The Guyana Fertility Survey, 1975: A Summary of Findings. Voorburg, Netherlands : London: International Statistical Institute ; World Fertility Survey, 1980.
MLA-referens (8:e uppl.)World Fertility Survey. The Guyana Fertility Survey, 1975: A Summary of Findings. International Statistical Institute ; World Fertility Survey, 1980.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.