Não informado. (1976). Advance Data from Vital & Health Statistics. National Center for Health Statistics.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Advance Data from Vital & Health Statistics. Hyattsville, Md: National Center for Health Statistics, 1976.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Advance Data from Vital & Health Statistics. National Center for Health Statistics, 1976.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.