Παραπομπή APA

Oetti, W., & Ritter, K. (1976). Optimizations and operations research. Springer - Verlag.

Παραπομπή Chicago Style

Oetti, W., και K. Ritter. Optimizations and Operations Research. New York: Springer - Verlag, 1976.

Παραπομπή MLA

Oetti, W., και K. Ritter. Optimizations and Operations Research. Springer - Verlag, 1976.