APA (7th ed.) Citation

O'Donovan, J. (1859). Zeuss's "Grammatica Celtica".

Chicago Style (17th ed.) Citation

O'Donovan, John. Zeuss's "Grammatica Celtica". 1859.

MLA (9th ed.) Citation

O'Donovan, John. Zeuss's "Grammatica Celtica". 1859.

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