1. Beadle, G W, and Emerson, S. 1935. Further studies of crossing-over in attached X chromosomes in Drosophila melanogaster. Genetics, 20, 192–206.
2. Bonnier, G, and Nordenskiöld, M. 1937. Studies in Drosophila melanogaster with attached X's. I. Crossing-over values. Frequencies of reciprocal and non-reciprocal changes. Chromatid interference. Hereditas, 33, 257–278.
3. Darlington, C D. 1931. The analysis of chromosome pairing in Triticum hybrids. Cytologia, 3, 21–25.
4. Darlington, C D. 1936. The external mechanics of the chromosomes. PRS, B., 121, 264–319.
5. Darlington, C D. 1937. Recent Advances in Cytology. 2nd ed. London.