ஜான் ஹென்றி விளைவு (Tamil Wikipedia)

Analysis of information sources in references of the Wikipedia article "ஜான் ஹென்றி விளைவு" in Tamil language version.

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archive.org

Cook, Thomas D.; Campbell, Donald Thomas (1979). Quasi-experimentation: Design & Analysis Issues for Field Settings (in ஆங்கிலம்). Boston: Houghton Mifflin. p. 55. ISBN 9780395307908.
Saretsky, Gary (1972). "The OEO P.C. Experiment and the John Henry Effect". The Phi Delta Kappan 53 (9): 579–581. https://archive.org/details/sim_phi-delta-kappan_1972-05_53_9/page/579.