There ain't no such thing as a free lunch (Vietnamese Wikipedia)

Analysis of information sources in references of the Wikipedia article "There ain't no such thing as a free lunch" in Vietnamese language version.

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archive.org

Keyes, Ralph (2006). The Quote Verifier. New York: St. Martin's Press. tr. 70. ISBN 978-0-312-34004-9.
Gwartney, James D.; Richard Stroup; Dwight R. Lee (2005). Common Sense Economics. New York: St. Martin's Press. tr. 8–9. ISBN 0-312-33818-X.

books.google.com

McConnell, Campbell R.; Stanley L. Brue (2005). Economics: principles, problems, and policies. Boston: McGraw-Hill Irwin. tr. 3. ISBN 978-0-07-281935-9. OCLC 314959936. Truy cập ngày 10 tháng 12 năm 2009.

nytimes.com

query.nytimes.com

Safire, William On Language; Words Left Out in the Cold" New York Times, 2-14-1993 [1]

worldcat.org

McConnell, Campbell R.; Stanley L. Brue (2005). Economics: principles, problems, and policies. Boston: McGraw-Hill Irwin. tr. 3. ISBN 978-0-07-281935-9. OCLC 314959936. Truy cập ngày 10 tháng 12 năm 2009.