Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Zimmermann, Klaus F., y Zvi Eckstein. Economic Theory of Optimal Population. Berlin [etc.]: Springer, 1989.

Cita MLA (9a ed.)

Zimmermann, Klaus F., y Zvi Eckstein. Economic Theory of Optimal Population. Springer, 1989.