"Theta Delta Chi." New York Saturday Press. (1859-6-11).
WORKS ABOUT - O'Brien, Fitz-James
G. A. [Arnold, George]. "Correspondence: A Letter from Long Shore." New York Saturday Press. (1859-8-13).
"Literary Notes." New York Saturday Press. (1859-9-24).
Gunn, Thomas Butler. "Diaries, Vol. 12." Diaries, Vol. 12. Missouri History Museum. (1860-1-1).
Gunn, Thomas Butler. "Diaries, Vol. 13." Diaries, Vol. 13. Missouri History Museum. (1860-1-1).
Clare, Ada. "Thoughts and Things." New York Saturday Press. (1860-1-21).
"Miss Prescott's New Story [for the New York Saturday Press]." New-York Saturday Press. (1860-3-24).
Quelqu'un [Winter, William]. "Dramatic Feuilleton." New-York Saturday Press. (1860-6-30).
Quelqu'un [Winter, William]. "Dramatic Feuilleton." New-York Saturday Press. (1860-7-14).
Quelqu'un [Winter, William]. "Dramatic Feuilleton." New-York Saturday Press. (1860-7-28).
Gunn, Thomas Butler. "Diaries, Vol. 18." Diaries, Vol. 18. Missouri History Museum. (1861-1-1).
Gunn, Thomas Butler. "Diaries, Vol. 16." Diaries, Vol. 16. Missouri History Museum. (1861-1-1).
Gunn, Thomas Butler. "Diaries, Vol. 17." Diaries, Vol. 17. Missouri History Museum. (1861-1-1).
Gunn, Thomas Butler. "Diaries, Vol. 15." Diaries, Vol. 15. Missouri History Museum. (1861-1-1).
Gunn, Thomas Butler. "Diaries, Vol. 20." Diaries, Vol. 20. Missouri History Museum. (1862-1-1).
Gunn, Thomas Butler. "Diaries, Vol. 19." Diaries, Vol. 19. Missouri History Museum. (1862-1-1).
Wood, Frank. "Fitz James O'Brien." New York Leader. (1862-4-12).
"Lieut. Fitz-James O'Brien, US Volunteers." Harper's Weekly. (1862-4-26).
Gunn, Thomas Butler. "Diaries, Vol. 22." Diaries, Vol. 22. Missouri History Museum. (1863-1-1).
Arnold, George. "O'Brien's Personal Characteristics." New York Citizen. (1865-9-30).