MLA

Boyd, Walter W. (Walter Willard),. Professor D.P.D. Wilkie, O.B.E., M.D., M.Ch., F.R.C.S. (Edinburg and England)/ Doctor John Powers. 1928-1932. https://collections.library.yale.edu/catalog/15951378.

APA, 6th edition

Boyd, Walter W. (Walter Willard),. (1928-1932)[Professor D.P.D. Wilkie, O.B.E., M.D., M.Ch., F.R.C.S. (Edinburg and England)/ Doctor John Powers]. https://collections.library.yale.edu/catalog/15951378.