Publications mentioning Plain Parakeets:
- Argel de Oliveira, M.M.; Figueiredo, R.A.D. "Birds Visiting an Isolated Fig-tree in Open Landscape, Espirito Santo, Brazil," Iheringia Serie Zoologia, 80 (1996): 127-134 (mentions plain parakeet).
- Lovell-Keays, L. "The Breeding of All-Green Parakeets (Brotogeris tirica) and Cactus Conures....," Bird Notes, 5 (1914B): 347-9.
- Pizo, Marco Aurelio, Isaac Simao and Mauro Galetti. "Daily Variation in Activity and Flock Size of Two Parakeet Species from Southeastern Brazil," The Wilson Bulletin," (June 1997) 109:343-348 (re: plain parakeet).
- Silva, Tony. "The Cyanistic Mutation of the Plain Parakeet," Avicultural Bulletin, 8 (1984B): 18-19.