A Natural and Human History of the Islands of Maine . Down East Books, Camden Maine. Croxall, J.P., ed. Population changes in New England seabirds. Drury, W.H. 1974.
Population changes in New England seabirds.
The Birder's Handbook . Hamlyn Limited, London. Junger, S. 1977. The Perfect Storm . W.W. Norton and Co. New York.