Friedrich, H., & Gutiérrez Girardot, R. (1973). Humanismo occidental. SUR.
Chicago Style (17th ed.) CitationFriedrich, Hugo, and Rafael Gutiérrez Girardot. Humanismo Occidental. Buenos Aires: SUR, 1973.
MLA (9th ed.) CitationFriedrich, Hugo, and Rafael Gutiérrez Girardot. Humanismo Occidental. SUR, 1973.