Roth, R. M. (1970). Underachieving students and guidance. Houghton Mifflin.
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Dyfyniad Arddull Chicago
Roth, Robert M. Underachieving Students and Guidance. New York: Houghton Mifflin, 1970.
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Dyfyniad MLA
Roth, Robert M. Underachieving Students and Guidance. Houghton Mifflin, 1970.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.