National Book Development Council of Singapore. (1981). First national readership survey. National Book Development Council of Singapore.
Citace podle Chicago (17th ed.)National Book Development Council of Singapore. First National Readership Survey. [Singapore]: National Book Development Council of Singapore, 1981.
Citace podle MLA (8th ed.)National Book Development Council of Singapore. First National Readership Survey. National Book Development Council of Singapore, 1981.
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