Hopf, L. (1948). Introduction to the differential equations of physics. Dover.
Lua i Stíl Chicago (17ú heag.)Hopf, L. Introduction to the Differential Equations of Physics. Nueva York: Dover, 1948.
Lua MLA (9ú heag.)Hopf, L. Introduction to the Differential Equations of Physics. Dover, 1948.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.