↑Gosler, Andrew; Clement, Peter (2007). „Family Paridae (Tits and Chickadees)“. Í del Hoyo, Josep; Elliott, Andrew; Christie, David (ritstjórar). Handbook of the Birds of the World. Volume 12: Picathartes to Tits and Chickadees. Barcelona: Lynx Edicions. bls. 662–709. ISBN978-84-96553-42-2.