Citação norma APA

Director of Census Operations. (1977). Census 1971. Director of Census Operations.

Citação norma Chicago

Director of Census Operations. Census 1971. Trivandrum: Director of Census Operations, 1977.

Citação norma MLA

Director of Census Operations. Census 1971. Director of Census Operations, 1977.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.