APA (7th ed.) Zitazioa

Ulam, S. M. (1964). Problems in modern mathematics. John Wiley & Sons.

Chicago Style (17th ed.) Zitazioa

Ulam, S. M. Problems in Modern Mathematics. Nueva York: John Wiley & Sons, 1964.

MLA (9th ed.) Zitazioa

Ulam, S. M. Problems in Modern Mathematics. John Wiley & Sons, 1964.