Bronfman, Mario, Brígida García, Fátima Juárez, Orlandina de Oliveira, and Julieta Quilodrán. 1990. Social sectors and reproduction in Mexico. DHS Further Analysis Reports No. 7. Columbia, Maryland, USA: Institute for Resource Development/Macro Systems Inc. Available at http://dhsprogram.com/pubs/pdf/FA7/FA7.pdf.