Citação norma APA

National Book Development Council of Singapore. (1981). First national readership survey. National Book Development Council of Singapore.

Citação norma Chicago

National Book Development Council of Singapore. First National Readership Survey. [Singapore]: National Book Development Council of Singapore, 1981.

Citação norma MLA

National Book Development Council of Singapore. First National Readership Survey. National Book Development Council of Singapore, 1981.

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