1. Allan, R. G., 1962, The Madeiran Storm Petrel Oceanodroma castro, Ibis
103b: 274–296.
2. Ar, A., and Yom-Tov, Y., 1978, The evolution of parental care, Evolution
32: 655–669.
3. Arnason, E., and Grant, P. R., 1978, The significanc of kleptoparasitism during the breeding season in a colony of Arctic Skuas Stercorarius parasiticus in Iceland, Ibis
120: 38–54.
4. Ashmole, N. P., 1963, The regulation of numbers of tropical oceanic birds, Ibis
103b: 458–473.
5. Ashmole, N. P., 1971, Seabird ecology and the marine environment, in: Avian Biology ( D. S. Farner and J. R. King, eds), Vol. 1, pp. 223–286, Academic Press, New York.