Παραπομπή APA

Oettli,W, Oettli, W., & Ritter, K. (1976). Optimization and operations research. Springer-Verlag.

Παραπομπή Chicago Style

Oettli,W, W. Oettli, και K. Ritter. Optimization and Operations Research. Berlin ; New York: Springer-Verlag, 1976.

Παραπομπή MLA

Oettli,W, et al. Optimization and Operations Research. Springer-Verlag, 1976.