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♦ ¹PARROT CLAYLICKS: DISTRIBUTION, PATTERNS OF USE AND ECOLOGICAL CORRELATES FROM A PARROT ASSEMBLAGE IN SOUTHEASTERN PERU, ALAN TRISTRAM KENNETH LEE, dissertation for DOCTOR OF PHILOSOPHY, Manchester Metropolitan University, November 2010
♦ ²Frugivory by Toucans (Ramphastidae) at Two Altitudes in the Atlantic Forest of Brazil, Mauro Galetti, Rudi Laps and Marco A. Pizo, BIOTROPICA 32(4b): 842-850 (2000)