1. Abdel-Hameed, F. (1967). Cytogenetic and evolutionary studies of the tetraploid Clarkia gracilis and its diploid ancestors. Thesis, University of California, Davis.
2. Abdel-Hameed, F. (1970). Reproductive and developmental differentiation within section Primigenia of the genus Clarkia. Trans. Ill. Acad. Sci. 63: 347?358.
3. Abdel-Hameed, F. (1971). Cytogenetic studies in Clarkia, section Primigenia. V. Interspecific hybridization between C. amoena huntiana and C. lassenensis. Evolution 25: (347?355).
4. Abdel-Hameed, F. & R. Snow (1968). Cytogenetic studies in Clarkia, section Primigenia. IV. A Cytological survey of Clarkia gracilis. Amer. J. Bot. 55: 1047?1054.
5. Beadle, G. W. (1929). A gene for supernumerary mitoses during spore development in Zea mays. Science 70: 406?407.