Hearn, C. J. 1969. Self-incompatibility and the effects of different pollen sources upon fruit characteristics of four Citrus hybrid. Proc. First Int. Citrus Symp. 1: 183–187.
Iwamasa, M. 1976. Cultivars of citrus (In Japanese). Shizuoka Citrus Grower’s Coop Association, Shimizu.
Iwamasa, M. and Y. Oba. 1980. Seedlessness due to self-incompatibility in Egami-Buntan, a Japanese pummelo cultivar. Bull. Fac. Agr., Saga Univ. 49: 39–45 (In Japanese with English summary).
Krezdorn, A. H. and F. A. Robinson. 1958. Unfruitfulness in the Orlando tangelo. Proc. Fla. State Hort. Sci. 71: 86–91.