Ó Casaide, S., & Ó Casaide, S. (1936). The historian of the de Lacy's (on the death of the Rev. Edward de Lacy Harnett).
Chicago Style (17th ed.) CitationÓ Casaide, Seamus, and Séamus Ó Casaide. The Historian of the De Lacy's (on the Death of the Rev. Edward De Lacy Harnett). 1936.
MLA (9th ed.) CitationÓ Casaide, Seamus, and Séamus Ó Casaide. The Historian of the De Lacy's (on the Death of the Rev. Edward De Lacy Harnett). 1936.
Warning: These citations may not always be 100% accurate.