1. Cytological studies of five interspecific hybrids of Crepis leontodontoides;Avery;Univ. Calif. Publ. Agricult. Sciences,1930
2. Babcock , E. B. Cameron , D. R. 1934 Chromosomes and phylogeny in Crepis. II. The relationships of one hundred nine species
3. Meiosis in two species and three hybrids of Crepis and its bearing on taxonomic relationship;Babcock;Univ. Calif. Publ. Agricult. Sciences,1929
4. The genus Crepis;Babcock;Bibliographia Genetica,1930
5. The structure of chromosomes;Belling;The British Journ. of Experimental Biology,1926