National Book Development Council of Singapore. (1981). First national readership survey. National Book Development Council of Singapore.
Style de citation Chicago (17e éd.)National Book Development Council of Singapore. First National Readership Survey. [Singapore]: National Book Development Council of Singapore, 1981.
Style de citation MLA (8e éd.)National Book Development Council of Singapore. First National Readership Survey. National Book Development Council of Singapore, 1981.
Attention : ces citations peuvent ne pas être correctes à 100%.