Harris, DC (2010). "Charles David Keeling and the story of atmospheric CO2 measurements". Analytical Chemistry. 82 (19): 7865–70. doi:10.1021/ac1001492. PMID20536268.
“The Keeling Curve Prize rewards a diverse selection of projects reducing greenhouse gas emissions or increasing carbon uptake.” Retrieved October 5, 2019.
Harris, DC (2010). "Charles David Keeling and the story of atmospheric CO2 measurements". Analytical Chemistry. 82 (19): 7865–70. doi:10.1021/ac1001492. PMID20536268.