1. Anon. (1974). “G. P. Kuiper.” Nature 248: 539.
2. Cruikshank, Dale P. (1974). “20th-Century Astronomer.” Sky & Telescope 47, no. 3: 159–164.
3. Doel, Ronald E. (1996). Solar System Astronomy in America: Communities, Patronage, and Interdisciplinary Science, 1920–1960. Cambridge: Cambridge University Press.
4. Green, D. W. E. (1999). “Book Review – Solar System Astronomy in America: Communities, Patronage, and Interdisciplinary Research.” International Comet Quarterly 21: 44–46. (Includes an extensive historical commentary on Kuiper’s poorly understood approach to small objects beyond Pluto.)
5. Kuiper, Gerard P. (1937). “On the Hydrogen Content of Clusters.” Astrophysical Journal 86: 176–197. (Kuiper included an early version of a color-magnitude diagram for galactic clusters.)