1. Babcock E. B. (1947a) The genusCrepis. 1: Taxonomy, phylogeny, distribution and evolution ofCrepis. Univ. Calif. Publ. Bot. 21: 1?197.
2. Babcock E. B. (1947b) The genusCrepis. 2: Systematic treatment. Univ. Calif. Publ. Bot. 22: 199?1030.
3. Babcock E. B., Cameron D. R. (1934) Chromosomes and phylogeny inCrepis, II: The relationships of one hundred eight species. Univ. Calif. Publ. Agric. Sci. 6: 287?324.
4. Babcock E. B., Cave M. S. (1938) A study of intra- and interspecific relations ofCrepis foetida L. Z. Indukt. Abstammungs-Vererbungsl. 75: 124?160.
5. Babcock E. B., Jenkins J. A. (1943) Chromosomes and phylogeny inCrepis, III: The relationships of one hundred and thirteen species. Univ. Calif. Publ. Agric. Sci. 18: 241?292.