Taylor، Angus (1989). "The Significance of Darwinian Theory for Marx and Engels". Philosophy of the Social Sciences. ج. 19 ع. 4: 409–423. DOI:10.1177/004839318901900401. S2CID:148748256.
Taylor، Angus (1989). "The Significance of Darwinian Theory for Marx and Engels". Philosophy of the Social Sciences. ج. 19 ع. 4: 409–423. DOI:10.1177/004839318901900401. S2CID:148748256.