1. Hortus Third: A Concise Dictionary of Plants Cultivated in the United States and Canada;Bailey,1976
2. The intrinsic rate of natural increase of an insect population;Birch;J. Anim. Ecol.,1948
3. Burkart, A., 1952. Las Leguminosas Argentines Silvestres y Cultivadas, Acme Agency, Soc. de Resp. Ltda., Buenos Aires
4. Regiones fitogeograficas Argentinas, Fac. 1;Cabrera,1976
5. Prognosis for biological control of weeds of southwestern US rangelands;DeLoach,1981