APA استشهاد

Collatz, L., & Wetterling, W. W. E. (1975). Optimization problems. Springer-Verlag.

استشهاد بنمط شيكاغو

Collatz, L., و Wolfgang W. E. Wetterling. Optimization Problems. New York: Springer-Verlag, 1975.

MLA استشهاد

Collatz, L., و Wolfgang W. E. Wetterling. Optimization Problems. Springer-Verlag, 1975.