1. Aguilar, P., 1973. Apuntes sobre las Lomas costaneras del Perú, Bol. Soc. Entom. Perú 7: 18?22.
2. Alberts, H. W., 1947. The forage resources of Latin America. Peru. Bull. 37, Imperial Bureau of Pastures and Forage Crops (Great Britain): 1?24.
3. Bruns, F., 1929. Beiträge zur Kenntnis der Vegetation des peruanischen Küstengebietes. Mitt. Inst. Allg. Bot. (Hamburg) 8: 1?85.
4. Caviedes, C., 1972. On the palsoclimatology of the Chilean litoral. The Iowa Geographer 29: 8?14.
5. Cody, M. L., 1974. Competition and the structure of bird communities. Monogr. Pop. Biol. 7: 1?318.