Phillips, R. E., and G. D. Carter. 1957. Winter food of western grebes. Murrelet 38:5-6.
Preble, E. A., and W. L. McAtee. 1923. A biological survey of the Pribilof Islands, Alaska. U.S. Bur. Biol. Surv. N. Am. Fauna 46. 255 pp.
Richardson, F. 1961. Breeding biology of the rhinoceros auklet on Protection Island, Washington. Condor 63:456-473.
Ripley, S. D. 1975. The view from the castle. Smithsonian 6:6.
Robbins, C. S., B. Brunn, and H. S. Zim. 1966. Birds of North America. Golden Press, N. Y. 340 pp.
Roberts, A. A., and E. H. Huntington. 1959. Food habits of the merganser in New Mexico. N. M. Dep. Fish Game, Bull. 9. 36 pp.
Robertson, I. 1974. The food of nesting double-crested and pelagic cormorants at Mandarte Island, British Columbia, with notes on feeding ecology. Condor 76:346-348.
Robertson, I. 1972. Studies on fish-eating birds and their influence on stocks of the Pacific herring, Clupea harengus, in the Gulf Islands of British Columbia. Herring Investigations, Pac. Biol. Stn., Naimo, B.C. 28 pp. (Unpublished report)
Sanger, G. A. 1972. Preliminary standing stock and biomass estimates of seabirds in the subarctic Pacific region. Pages 589-611 in A. Y. Takenouti et al., eds. Biological oceanography of the northern north Pacific Ocean. Idemitsu Shoten, Tokyo. 626 pp.