Masello, J; Pagnossin, M; Sommer, C & P Quillfeldt (2006) "Population size, provisioning frequency, flock size and foraging range at the largest known colony of Psittaciformes: the Burrowing Parrots of the north-eastern Patagonian coastal cliffs" Emu106 (1): 69-79 doi:10.1071/MU04047
Masello, J; Pagnossin, M; Sommer, C & P Quillfeldt (2006) "Population size, provisioning frequency, flock size and foraging range at the largest known colony of Psittaciformes: the Burrowing Parrots of the north-eastern Patagonian coastal cliffs" Emu106 (1): 69-79 doi:10.1071/MU04047