1. Abdalla, M. M. F. & J. G. Th., Hermsen, 1972. Unilateral incompatibility: hypotheses, debate and its implications for plant breeding. Euphytica 21: 32–47.
2. Andersen, K., 1971. The behavior of powdery mildew conidia (Erysiphe cichoracearum) on the leaves of resistant and susceptible species of Zinnia. M. S. thesis, Penn. State University.
3. Baker, K. F. & L. F., Davis, 1950. Some diseases of ornamental plants in california caused by species of Alternaria and Stemphylium. Plant Dis. Rptr 34: 403–413.
4. Beeks, R. M., 1954. The herbaceous Zinnias: history, cytology, development of cultivars. M. A. thesis, Claremont Graduate School.
5. Bose, S. & U. C., Panigrahi, 1969. Studies on induced polyploidy in Zinnia linearis
Benth. Cytologia 34: 103–111.