Wilson, R., Wilson, R., Shepard, E., Laich, A. G., Frere, E., Quintana, F., & Shepard, E. (2010). Pedalling downhill and freewheeling up; a penguin perspective on foraging. Aquatic Biology, 8, p. 193. doi:10.3354/ab00230

Wilson, Rory, RP Wilson, ELC Shepard, A Gómez Laich, E. Frere, F. Quintana, and Emily Shepard. "Pedalling Downhill and Freewheeling Up; a Penguin Perspective On Foraging." Aquatic Biology 8 (2010): 193.

Wilson, Rory, et al. "Pedalling Downhill and Freewheeling Up; a Penguin Perspective On Foraging." Aquatic Biology 8 (2010): 193.