Bury, J. B., & Beard, C. A. (1955). The idea of progess: An inquiry into its origin and growth. New York: Dover Publications.
Παραπομπή Chicago StyleBury, J. B., and Charles A. Beard. The Idea of Progess: An Inquiry Into Its Origin and Growth. New York: Dover Publications, 1955.
Παραπομπή MLABury, J. B., and Charles A. Beard. The Idea of Progess: An Inquiry Into Its Origin and Growth. New York: Dover Publications, 1955.
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