Courant, R. a. R. H. (1946). What is mathematics? Oxford University.
Lua i Stíl Chicago (17ú heag.)Courant, Richard and Robbins Herbert. What Is Mathematics? Oxford University, 1946.
Lua MLA (9ú heag.)Courant, Richard and Robbins Herbert. What Is Mathematics? Oxford University, 1946.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.