1. The genus Crepis. I. Taxonomy, phylogeny, distribution and evolution of Crepis;Babcock;University of California Publications in Botany,1947a
2. The genus Crepis. II. Systematic treatment;Babcock;University of California Publications in Agricultural Science,1947b
3. Chromosomes and phylogeny in Crepis. II. The relationships of one hundred and eight species;Babcock;University of California Publications in Agricultural Science,1934
4. Chromosomes and phylogeny in Crepis. III. The relationships of one hundred and thirteen species;Babcock;University of California Publications in Agricultural Science,1943
5. The genus Crepis;Babcock;Bibliographia Genetica,1930