Alfalfa leafcutter bee: origin of the female and its influence on diapause
Proceedings of the IVth Symposium on Pollination. Maryland Agricultural Experiment Station Miscellaneous Publications
Parker, F. D. 1979. Alfalfa leafcutter bee: origin of the female and its influence on diapause. Proc. IVth Symp. on Pollination. Md. Agric. Exp. Sta. Spec. Misc. Publ. 1:269- 272.