APA (7th ed.) Citation

Zimmermann, K. F., & Eckstein, Z. (1989). Economic theory of optimal population. Springer-Verlag.

Chicago Style (17th ed.) Citation

Zimmermann, Klaus F., and Zvi Eckstein. Economic Theory of Optimal Population. Berlin ; New York: Springer-Verlag, 1989.

MLA (8th ed.) Citation

Zimmermann, Klaus F., and Zvi Eckstein. Economic Theory of Optimal Population. Springer-Verlag, 1989.