APA (7th ed.) Citation

Zimmermann, K. F. (1989). Economic Theory of Optimal Population. Springer Berlin Heidelberg.

Chicago Style (17th ed.) Citation

Zimmermann, Klaus F. Economic Theory of Optimal Population. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989.

MLA (9th ed.) Citation

Zimmermann, Klaus F. Economic Theory of Optimal Population. Springer Berlin Heidelberg, 1989.