Puffer, R. R. (1987). Patterns of birthweights. Pan American Health Organization.
Cita Chicago Style (17a ed.)Puffer, Ruth Rice. Patterns of Birthweights. Washington, D.C: Pan American Health Organization, 1987.
Cita MLA (9a ed.)Puffer, Ruth Rice. Patterns of Birthweights. Pan American Health Organization, 1987.
Precaución: Estas citas no son 100% exactas.