Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.