David A. Sanchez, R. C. A. J. Differential equations an introduction. Addison Wesley Publishing Company.
Lua i Stíl Chicago (17ú heag.)David A. Sanchez, Richard C. Allen Jr. Differential Equations an Introduction. Addison Wesley Publishing Company.
Lua MLA (8ú heag.)David A. Sanchez, Richard C. Allen Jr. Differential Equations an Introduction. Addison Wesley Publishing Company.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.