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♦ ¹FORAGING ECOLOGY OF PARROTS IN A MODIFIED LANDSCAPE: SEASONAL TRENDS AND INTRODUCED SPECIES, GREG D. MATUZAK, M. BERNADETTE BEZY, AND DONALD J. BRIGHTSMITH, The Wilson Journal of Ornithology 120(2):353–365, 2008
♦ ²PARROT 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