Cho, L., Bogue, D. J., & Grabill, W. H. (1970). Differential current fertility in the United States. Community Family Study Center.
Chicago-referens (17:e uppl.)Cho, Lee-Jay, Donald J. Bogue, och Wilson H. Grabill. Differential Current Fertility in the United States. Chicago: Community Family Study Center, 1970.
MLA-referens (9:e uppl.)Cho, Lee-Jay, et al. Differential Current Fertility in the United States. Community Family Study Center, 1970.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.