Among his most famous geometry books are The real projective plane (1955), Introduction to geometry (1961), Regular polytopes (1963), Non-euclidean geometry (1965) and, written jointly with S L Greitzer, Geometry revisited (1967).
Sa kanyang pinaka-tanyag na mga libro ay geometry Ang tunay na projective eroplano (1955), Panimula sa geometry (1961), Regular na polytopes (1963), Non-euclidean geometry (1965), at nakasulat na sama-sama sa SL Greitzer, geometry revisited (1967).