Crapo, H. H., & Rota, G. (1970). On the foundations of combinatorial theory: Combinatorial geometries (Prelim. ed.). M.I.T. Press.
Dyfyniad Arddull ChicagoCrapo, Henry H., and Gian-Carlo Rota. On the Foundations of Combinatorial Theory: Combinatorial Geometries. Prelim. ed. Cambridge, Mass.: M.I.T. Press, 1970.
Dyfyniad MLACrapo, Henry H., and Gian-Carlo Rota. On the Foundations of Combinatorial Theory: Combinatorial Geometries. Prelim. ed. M.I.T. Press, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.