Gray, D. E. (1966). Man and his physical world. D. Van Nostrand.
Chicago-čujuhus (17. p.)Gray, Dwight E. Man and His Physical World. Princeton: D. Van Nostrand, 1966.
MLA-čujuhus (9. p.)Gray, Dwight E. Man and His Physical World. D. Van Nostrand, 1966.
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