O'Neill, J. (1868). Letter, To: F.B. Gallagher Esq From: John O'Neill, February 29, 1868.
Chicago-referens (17:e uppl.)O'Neill, John. Letter, To: F.B. Gallagher Esq From: John O'Neill, February 29, 1868. 1868.
MLA-referens (8:e uppl.)O'Neill, John. Letter, To: F.B. Gallagher Esq From: John O'Neill, February 29, 1868. 1868.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.