Citação norma APA

Kerala. Directorate of Census Operations; Author. (1991). District census handbook 1991: Ernakulam district: Census of Kerala 1991.

Citação norma Chicago

Kerala. Directorate of Census Operations; Author. District Census Handbook 1991: Ernakulam District: Census of Kerala 1991. Kerala, Director of Census Operations, 1991.

Citação norma MLA

Kerala. Directorate of Census Operations; Author. District Census Handbook 1991: Ernakulam District: Census of Kerala 1991. 1991.

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