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♦ ¹Birds and berries: a study of an ecological interaction. Calton, Great Britain, Snow B.K., Snow D.W., 1988, T & AD Poyser. 268 p.
♦ ²Temporal and Spatial Variation in the Diet of the Endemic Lizard Gallotia galloti in an Insular Mediterranean Scrubland, Airam Rodríguez, Manuel Nogales, Beatriz Rumeu, and Beneharo Rodríguez, Journal of Herpetology, Vol. 42, No. 2, pp. 213–222, 2008
♦ ³A STUDY OF AVIAN FRUGIVORES, BIRD-DISPERSED PLANTS, AND THElR INTERACTION IN MEDITERRANEAN SCRUBLANDS, CARLOS M. HERRERA, Ecological Monographs, 54(1), 1984, pp. 1-23