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♦ 1DIET AND FLOCK SIZE OF SYMPATRIC PARROTS IN THE ATLANTIC FOREST OF BRAZIL, Marco Aurélio Pizo, Isaac Simāo & Mauro Galetti, ORNITOLOGIA NEOTROPICAL 6: 87-95, 1995
♦ 2Tropical Fruit-Eating Birds and Their Food Plants: A Survey of a Costa Rican Lower Montane Forest, Nathaniel T. Wheelwright, William A. Haber, K. Greg Murray, Carlos Guindon, Biotropica Vol. 16, No. 3 (Sep., 1984), pp. 173-192