Courant, R. a. R. H. (1946). What is mathematics? Oxford University.
Chicago-čujuhus (17. p.)Courant, Richard and Robbins Herbert. What Is Mathematics? Oxford University, 1946.
MLA-čujuhus (9. p.)Courant, Richard and Robbins Herbert. What Is Mathematics? Oxford University, 1946.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.