BioStor
 | A new subspecies of the Snail Kite, Rostrhamus sociabilis (Vieillot) E W Nelson and E A Goldman (1933) Proceedings of the Biological Society of Washington 46: 193-194 |
 | The birds of southern Veracruz, Mexico Alexander Wetmore (1943) Proceedings of The United States National Museum 93: 215-340 |