Cambridge, MIT Press, 1999. Cloth with dustjacket, 26 cm, 697 pp. Ills.: black and white illustrations. Cond.: zeer goed / very good. ISBN: 0262161818.
New York, Columbia University Press, 1970. Hardcover with dustjacket, 22 cm, 84 pp. "Woodbridge Lectures, number eight". Cond.: goed / good. ISBN: 0231033869. Woodbridge Lectures, number eight.