Παραπομπή APA

Ricardo, H. J. (2009). Modern introduction to differential equations (23.).

Παραπομπή Chicago Style

Ricardo, Hentry J. Modern Introduction to Differential Equations. 23. Elsevier Academic Press, 2009.

Παραπομπή MLA

Ricardo, Hentry J. Modern Introduction to Differential Equations. 23. 2009.