Attributes / relations provided by
♦ ¹THE ROLE OF SEED DISPERSERS IN THE POPULATION DYNAMICS OF THE COLUMNAR CACTUS NEOBUXBAUMIA TETETZO, HÉCTOR GODÍNEZ-ALVAREZ, ALFONSO VALIENTE-BANUET, AND ALBERTO ROJAS-MARTÍNEZ, Ecology, 83(9), 2002, pp. 2617-2629
♦ ²del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.