M. H. Day and E. H. Wickens. Laetoli Pliocene hominid footprints and bipedalism. Nature, volume 286, issue 5771, pages 385-387, July 1980.

M. H. Day, M. D. Leakey, and T. R. Olson. On the Status of Australopithecus afarensis. Science, JSTOR, volume 207, issue 4435, pages 1102-1103, March 1980.

M. H. Day, R. E. F. Leakey, A. C. Walker, and B. A. Wood. New hominids from East Turkana, Kenya. American Journal of Physical Anthropology, volume 45, issue 3, pages 369-436, 1976.

M. H. Day, R. E. F. Leakey, A. C. Walker, and B. A. Wood. New Hominids from East-Rudolf, Kenya, 1. American Journal of Physical Anthropology, volume 42, issue 3, pages 461-475, 1975.

M. H. Day and R. E. F. Leakey. New evidence of the genus Homo from East Rudolf, Kenya. III. American Journal of Physical Anthropology, volume 41, issue 3, pages 367-380, 1974.

M. H. Day and R. E. F. Leakey. New evidence of the genus Homo from East Rudolf, Kenya. I. American Journal of Physical Anthropology, volume 39, issue 3, pages 341-354, 1973.

M. H. Day and B. A. Wood. Functional Affinities of the Olduvai Hominid 8 Talus. Man, [Wiley, Royal Anthropological Institute of Great Britain and Ireland], volume 3, issue 3, pages 440-455, 1968.