Billington, D. P. (1966). The innovators: The engineering pioneers who made America modern. New York: Wiley.
Chicago Style aipamenaBillington, David P. The Innovators: The Engineering Pioneers Who Made America Modern. New York: Wiley, 1966.
MLA aipamenaBillington, David P. The Innovators: The Engineering Pioneers Who Made America Modern. New York: Wiley, 1966.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.