Källender, H. 1974. Advancement of laying of great tits by the provision of food. Ibis 116:365-367.
Katz, P. L. 1974. A long-term approach to foraging optimization. Am. Nat. 108:758-782.
Kendeigh, S. C. 1970. Energy requirements for existence in relation to size of bird. Condor 72:60-65.
Kendeigh, S. C. 1972. Monthly variations in the energy budget of the house sparrow throughout the year. Pages 17-43 in S. C. Kendeigh and J. Pinowski, eds. Productivity, population dynamics and systematics of granivorous birds. Institute of Ecology, Polish Academy of Science, Warsaw.
Kendeigh, S. C. 1973. [Discussion.] Pages 311-320 in D. S. Farner, ed. Breeding biology of birds. National Academy of Sciences, Washington, D.C.
King, J. R. 1973. Energetics of reproduction in birds. Pages 78-107 in D. S. Farner, ed. Breeding biology of birds. National Academy of Science, Washington, D.C.
King, J. R. 1974. Seasonal allocation of time and energy resources in birds. Pages 4-70 in R. A. Paynter, ed. Avian energetics. Publ. Nuttall Ornithol. Club 15.
Koelink, A. F. 1972. Bioenergetics of growth in the pigeon guillemot, Cepphus columba. M.S. Thesis. Univ. of British Columbia, Vancouver.
Koskimies, J., and L. Lahti. 1964. Cold-hardiness of the newly hatched young in relation to ecology and distribution in ten species of European ducks. Auk 81:281-307.
Lack, D. 1966. Population studies of birds. Clarendon Press, Oxford.