Harris، DC (2010). "Charles David Keeling and the story of atmospheric CO2 measurements". Analytical Chemistry. ج. 82 ع. 19: 7865–70. DOI:10.1021/ac1001492. PMID:20536268.
Heimann، M (2005). "Obituary: Charles David Keeling 1928–2005". Nature. ج. 437 ع. 7057: 331. DOI:10.1038/437331a. PMID:16163339.
Keeling, Charles D. (1960). "The Concentration and Isotopic Abundances of Carbon Dioxide in the Atmosphere". Tellus (بالإنجليزية). 12 (2): 200–203. DOI:10.1111/j.2153-3490.1960.tb01300.x. ISSN:2153-3490.
Harris، DC (2010). "Charles David Keeling and the story of atmospheric CO2 measurements". Analytical Chemistry. ج. 82 ع. 19: 7865–70. DOI:10.1021/ac1001492. PMID:20536268.
Heimann، M (2005). "Obituary: Charles David Keeling 1928–2005". Nature. ج. 437 ع. 7057: 331. DOI:10.1038/437331a. PMID:16163339.
Keeling, Charles D. (1960). "The Concentration and Isotopic Abundances of Carbon Dioxide in the Atmosphere". Tellus (بالإنجليزية). 12 (2): 200–203. DOI:10.1111/j.2153-3490.1960.tb01300.x. ISSN:2153-3490.