(1963). Axiomatic projective geometry.
Chicago-čujuhus (17. p.)Axiomatic Projective Geometry. 1963.
MLA-čujuhus (9. p.)Axiomatic Projective Geometry. 1963.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.
APA-čujuhus (7. p.)