Egerton، Frank (1970). "Humboldt, Darwin, and population". Journal of the History of Biology. ج. 3 ع. 2: 325–60. DOI:10.1007/BF00137357. PMID:11609656.
Bunkse، Edmunds V. (1981). "Humboldt and an Aesthetic Tradition in Geography". Geographical Review. ج. 71 ع. 2: 127–146. DOI:10.2307/214183. JSTOR:214183.
Egerton, Frank N. (1 Sep 1970). "Humboldt, Darwin, and population". Journal of the History of Biology (بالإنجليزية). 3 (2): 325–360. DOI:10.1007/BF00137357. ISSN:0022-5010. PMID:11609656.
Bunkse، Edmunds V. (1981). "Humboldt and an Aesthetic Tradition in Geography". Geographical Review. ج. 71 ع. 2: 127–146. DOI:10.2307/214183. JSTOR:214183.
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pubmed.ncbi.nlm.nih.gov
Egerton، Frank (1970). "Humboldt, Darwin, and population". Journal of the History of Biology. ج. 3 ع. 2: 325–60. DOI:10.1007/BF00137357. PMID:11609656.
Egerton, Frank N. (1 Sep 1970). "Humboldt, Darwin, and population". Journal of the History of Biology (بالإنجليزية). 3 (2): 325–360. DOI:10.1007/BF00137357. ISSN:0022-5010. PMID:11609656.
Egerton, Frank N. (1 Sep 1970). "Humboldt, Darwin, and population". Journal of the History of Biology (بالإنجليزية). 3 (2): 325–360. DOI:10.1007/BF00137357. ISSN:0022-5010. PMID:11609656.