Levitt, E. E. (1967). The psychology of anxiety (ed.). Bobbs-Merrill.
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Dyfyniad Arddull Chicago
Levitt, Eugene E. The Psychology of Anxiety. ed. Indianapolis: Bobbs-Merrill, 1967.
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Dyfyniad MLA
Levitt, Eugene E. The Psychology of Anxiety. ed. Bobbs-Merrill, 1967.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.