(en) Emmons William H., Simon Charles W., « The Non-Recall of Material Presented During Sleep », American Journal of Psychology, , p. 69(1):76-81 (lire en ligne)
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(en) Fox, B.H.; Robbin, J.S., « The Retention of Material Presented During Sleep », Journal of Experimental Psychology, no 43, , p. 75–79 (lire en ligne)