Cloud, Preston E. Jr. (1948). "Some problems and patterns of evolution exemplified by fossil invertebrates". Evolution. 2 (4): 322–350. doi:10.2307/2405523. JSTOR2405523. PMID18122310.
Bretsky, Sara S. (1979). "Review of Cosmos, Earth, and Man by Preston Cloud". The Quarterly Review of Biology. 54 (2): 220–221. doi:10.1086/411287.
gf.org
"Preston Cloud". Johna Simon Guggenheim Memorial Foundation. Archived from the original on September 7, 2014. Retrieved September 7, 2014.
Cloud, Preston E. Jr. (1948). "Some problems and patterns of evolution exemplified by fossil invertebrates". Evolution. 2 (4): 322–350. doi:10.2307/2405523. JSTOR2405523. PMID18122310.
Rodgers, John (1992). "Preston Cloud (September 26, 1912-January 16, 1991)". Proceedings of the American Philosophical Society. 136 (2): 280–287. JSTOR987173.
Crowell, John C. (1995). "Preston Cloud September 26, 1912–January 16, 1991"(PDF). Biographical Memoir of the National Academy of Sciences. National Academies Press. pp. 43–63. Retrieved September 7, 2014.
Cloud, Preston E. Jr. (1948). "Some problems and patterns of evolution exemplified by fossil invertebrates". Evolution. 2 (4): 322–350. doi:10.2307/2405523. JSTOR2405523. PMID18122310.