Armstrong, W. H. (1967). Study is hard work (2nd ed.). Harper $ row.
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Dyfyniad Arddull Chicago
Armstrong, William H. Study Is Hard Work. 2nd ed. New York: Harper $ row, 1967.
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Dyfyniad MLA
Armstrong, William H. Study Is Hard Work. 2nd ed. Harper $ row, 1967.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.