1. 24) Swingle, W. T., The botany ofCitrusand its wild relatives of the orange subfamily. In “The Citrus Industry Vol. I: History, Botany, and Breeding”, eds. Webber, H. J., and Batchelor, L. D., University of California Press, Berkeley, pp. 129–474 (1943).
2. 25) Swingle, W. T., and Reece, P. C., The botany ofCitrusand its wild relatives. In “The Citrus Industry Vol. I: History, World Distribution, Botany, and Varieties”, eds. Reuter, W., Webber, H. J., and Batchelor, L. D., University of California Division of Agricultural Science, Berkeley, pp. 190–423 (1967).