Torry Research Station. "The haddock". Food and Agriculture Organization of the United Nations.
gma.org
Henry B. Bigelow; William C. Schroeder (1953). "Haddock Melanogrammus aeglefinus". Fishes of the Gulf of Maine. United States Fish and Wildlife Service.
marlin.ac.uk
Barnes, M. K. S. (2008). "Melanogrammus aeglefinus Haddock". Marine Life Information Network: Biology and Sensitivity Key Information Reviews. Marine Biological Association of the United Kingdom.