Rice, D.S. (1955). "Rev. of Ettinghausen, The Unicorn". Bulletin of the School of Oriental and African Studies, University of London17 (1): 172–74. doi:10.1017/s0041977x00106470.
Sarton, George; Frances Siegel (1951). "Seventy-Seventh Critical Bibliography of the History and Philosophy of Science and of the History of Civilization (To March 1951)". Isis42 (4): 309–95. doi:10.1086/349357.