Haunts of British Divers
Rankin, Niall
Auks: An Ornithologist's Guide
Freethy, Ron
Life Histories of North American Diving Birds
Bent, Arthur Cleveland
Penguins
Davis, Lloyd Spencer and Martin Renner
A Population Study of Penguins
Richdale, L.E.
Loon Magic
Klein, Tom
Diving Birds of North America
Johnsgard, Paul A.
Project Puffin
Kress, Stephen W.; Derrick Z. Jackson
The Skuas
Furness, Robert W.
Osteology and Myology of the Head and Neck of the Pied-Billed Grebes (Podilymbus).
Zusi, Richard L. and Robert W. Storer
Red-throated Loon: Birds of North America species account
Jack F. Barr, Christine Eberl, & Judith W. McIntyre.
Pacific Loon/Arctic Loon: Birds of North America species account
R.W. Russell.