スペイン文学
Beginning in the fall of 1945 he studied Spanish literature at Princeton University, receiving his doctorate in Spanish literature and Romance languages in 1955 with a thesis entitled "La gesta de las mocedades de Rodrigo: Reflections of a Lost Epic Poem in the Cronica de los Reyes de Castilla and the Cronica General de 1344", written under the direction of Américo Castro.