Gaya APA

Brauer, F., A., I, N, J. (NULL). Problems and solutions in ordinary differential equations . New: New York: W.A. Benjamin; 1968.

Gaya MLA

Brauer, Fred., A., I., Nohel,, John. "Problems and solutions in ordinary differential equations". New: New York: W.A. Benjamin; 1968, NULL. Text.