Obituary: David Lambert Lack ScD, FRS (1910-1973), vol. 66, 7, British Birds, juli 1973, s. 299-303, läs online och läs onlineläs online.[källa från Wikidata]
docs.google.com
läs online, docs.google.com .[källa från Wikidata]
David Lack, 1967, The significance of clutch-size in waterfowl, i The Wildfowl Trust Eighteenth Annual Report sid. 125: "The clutch-size of birds which feed their nestlings has been evolved in relation to the size of brood from which, on average, most young survive, the limit being set by the amount of food which the parents can bring to the young."