APA (7th ed.) Citation

Ó Casaide, S. John D'Alton's manuscripts.

Chicago Style (17th ed.) Citation

Ó Casaide, Séamus. John D'Alton's Manuscripts.

MLA (9th ed.) Citation

Ó Casaide, Séamus. John D'Alton's Manuscripts.

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