APA (7th ed.) Citation

Gathmann, C., & Keller, N. (2014). Returns to citizenship? Evidence from Germany's recent immigration reforms. Bonn.

Chicago Style (17th ed.) Citation

Gathmann, Christina, and Nicolas Keller. Returns to Citizenship? Evidence from Germany's Recent Immigration Reforms. Bonn, 2014.

MLA (8th ed.) Citation

Gathmann, Christina, and Nicolas Keller. Returns to Citizenship? Evidence from Germany's Recent Immigration Reforms. Bonn, 2014.

Warning: These citations may not always be 100% accurate.