Fjeldså, J., & N. Krabbe (1990). The Birds of the High Andes. Zoological Museum, University of Copenhagen, Copenhagen. ISBN 87-88757-16-1
Fjeldså, J. & M. Kessler. 1996. Conserving the biological diversity of Polylepis woodlands of the highlands on Peru and Bolivia, a contribution to sustainable natural resource management in the Andes. NORDECO, Copenhagen.
