Reed, Marvin Elijah, Jr.  "Theodore Roosevelt: The Search For Community In The Urban Age" (Tulane University, Graduate Program In Biomedical Sciences Proquest Dissertations Publishing, 1971. 7214199).
Reter, Ronald Francis. "The Real Versus The Rhetorical Theodore Roosevelt In Foreign Policy-Making" (University Of Georgia Proquest Dissertations Publishing, 1973. 7331949).
Primary sources

Auchincloss, Louis, ed. Theodore Roosevelt: Letters and Speeches (2004)
Brands, H. W. The selected letters of Theodore Roosevelt (2001) online
O'Toole, Patricia ed. In the Words of Theodore Roosevelt : Quotations from the Man in the Arena (Cornell University Press, 2012)
Hart, Albert Bushnell, and Herbert Ronald Ferleger, Theodore Roosevelt Cyclopedia (1941) online, short excerpts.
Morison, Elting E. ed. The letters of Theodore Roosevelt (8 vol Harvard UP, 1951-1954); vol 7 online covers 1909-1912
The Complete Works of Theodore Roosevelt  (2017) 4500 pages in Kindle format   online for $1 at Amazon
Kohn, Edward P., ed. A Most Glorious Ride: The Diaries of Theodore Roosevelt, 1877–1886 (State University of New York Press, 2015), 284 pp.
Bishop, Joseph Bucklin, ed. (1920), Theodore Roosevelt and His Time Shown in His Own Letters vol. 