APA (7th ed.) Citation

Perli, P., & Birka, E. (1975). Kopfschmerzrn.

Chicago Style (17th ed.) Citation

Perli, P., and E. Birka. Kopfschmerzrn. Leipzig, 1975.

MLA (8th ed.) Citation

Perli, P., and E. Birka. Kopfschmerzrn. 1975.

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