Billington, D. P. (1979). Robert Maillart's bridges: : the art of engineering. Princeton, N.J.: Princeton University Press.
Παραπομπή Chicago StyleBillington, David P. Robert Maillart's Bridges: : The Art of Engineering. Princeton, N.J.: Princeton University Press, 1979.
Παραπομπή MLABillington, David P. Robert Maillart's Bridges: : The Art of Engineering. Princeton, N.J.: Princeton University Press, 1979.
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