APA استشهاد

Tikhonov, A. N. (1984). Differential equations. Springer- Verlog.

استشهاد بنمط شيكاغو

Tikhonov, A. N. Differential Equations. Berlin: Springer- Verlog, 1984.

MLA استشهاد

Tikhonov, A. N. Differential Equations. Springer- Verlog, 1984.