APA (7th ed.) Citation

Ahrens, J., & Ohr, R. (2007). Europäische Union ohne Grenzen? Duncker & Humblot.

Chicago Style (17th ed.) Citation

Ahrens, Joachim, and Renate Ohr. Europäische Union Ohne Grenzen? Berlin: Duncker & Humblot, 2007.

MLA (8th ed.) Citation

Ahrens, Joachim, and Renate Ohr. Europäische Union Ohne Grenzen? Duncker & Humblot, 2007.

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