Cantin, M., J. Bedard, and H. Milne. The food and feeding of common eiders in the St. Lawrence estuary in summer. Conkling, P. W. 1981. Down East Books, Camden, Maine. Drury, W. H. 1973.
Population changes in New England seabirds.
Erwin, R. M. 1979. Washington, D.C. 212 pp. Knight, O. W. 1897. A list of the birds of Maine, showing their distribution by counties and their status in each county. Kennebec Journal Print, Augusta, Maine.