Smith, W. C., & Falk, I. S. (1939). Social Security Needs for Vital Statistics Records.
Citación estilo ChicagoSmith, Willard C., and I. S. Falk. Social Security Needs for Vital Statistics Records. 1939.
Cita MLASmith, Willard C., and I. S. Falk. Social Security Needs for Vital Statistics Records. 1939.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.