Dyfyniad APA
Foulkes, D. (1966). The psychology of sleep. Charles scribner's sons.
Dyfyniad Arddull Chicago
Foulkes, David. The Psychology of Sleep. New York: Charles scribner's sons, 1966.
Dyfyniad MLA
Foulkes, David. The Psychology of Sleep. Charles scribner's sons, 1966.
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