Robbins, L. (1952). An essay on the nature & significance of eco.sc (2nd rev.). Macmillan.
Chicago-čujuhus (17. p.)Robbins, Liohel. An Essay on the Nature & Significance of Eco.sc. 2nd rev. London: Macmillan, 1952.
MLA-čujuhus (9. p.)Robbins, Liohel. An Essay on the Nature & Significance of Eco.sc. 2nd rev. Macmillan, 1952.
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