Rattenborg, N. C., Mandt, B. H., Obermeyer, W. H., Winsauer, P. J., Huber, R., Wikelski, M., & Benca, R. M. (2004). Migratory Sleeplessness in the White-Crowned Sparrow (Zonotrichia leucophrys gambelii). Public Library of Science.

Rattenborg, Niels C., Bruce H. Mandt, William H. Obermeyer, Peter J. Winsauer, Reto Huber, Martin Wikelski, and Ruth M. Benca. Migratory Sleeplessness in the White-Crowned Sparrow (Zonotrichia Leucophrys Gambelii). Public Library of Science, 2004.

Rattenborg, Niels C., et al. Migratory Sleeplessness in the White-Crowned Sparrow (Zonotrichia Leucophrys Gambelii). Public Library of Science, 2004.