Παραπομπή APA

Zill, D. G. (1982). First course in differential equations with applications (23.).

Παραπομπή Chicago Style

Zill, Dennis G. First Course in Differential Equations with Applications. 23. Prindle, Weber & Schmidt, Boston, 1982.

Παραπομπή MLA

Zill, Dennis G. First Course in Differential Equations with Applications. 23. 1982.