Trích dẫn APA

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

Trích dẫn kiểu Chicago

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

Trích dẫn MLA

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

Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.