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♦ ¹Estimating prey capture rates of a planktivorous seabird, the little auk (Alle alle), using diet, diving behaviour, and energy consumption, Ann Marie Aglionby Harding, Carsten Egevang, Wojciech Walkusz, Flemming Merkel, Ste ́phane Blanc, David Grémillet, Polar Biol (2009) 32:785–796
♦ ²Food Web Relationships of Northern Puget Sound and the Strait of Juan de Fuca : a Synthesis of the Available Knowledge, Charles A. Simenstad, Bruce S. Miller, Carl F. Nyblade, Kathleen Thornburgh, and Lewis J. Bledsoe, EPA-600 7-29-259 September 1979