Schemes including Spizella breweri

• eBird/Clements Checklist 6.8 Spizella breweri
• IUCN Red List of Threatened Species. Version 2012.1 Spizella breweri
• eBird/Clements Checklist 6.7 Spizella breweri
• IUCN Red List of Threatened Species. Version 2012.2 (160032364) Spizella breweri
• CONABIO (189543AVESB501112) Spizella breweri
• NatureServe Explorer: An online encyclopedia of life. Version 7.1 (ELEMENT_GLOBAL.2.100732) Spizella breweri
• eBird/Clements Checklist 6.9 Spizella breweri
• GBIF (2492099) Spizella breweri
• eBird/Clements Checklist v2017 Spizella breweri