Leonard Dinnerstein, The Leo Frank Case (NY: Columbia U. Press, 1968) — still the standard account. While dated, the bibliography is still useful. Can mine footnotes for leads.

Steve Oney, And The Dead Shall Rise: The Murder of Mary Phagan and the Lynching of Leo Frank (NY: Pantheon, 2003) — popular but carefully documented account; best on the lynching

Nancy MacLean, "Gender, Sexuality, and the Politics of Lynching: The Leo Frank Case Revisited," in Under Sentence of Death: Lynching in the South, edited by W. Fitzhugh Brundage (Chapel Hill: University of North Carolina Press, 1997), 158-188 — a must read. An earlier version, with fuller notes, is "The Leo Frank Case Reconsidered: Gender and Sexual Politics in the Making of Reactionary Populism," Journal of American History 77 (Dec. 1991), 917-48. This earlier version is available online via JSTOR (library subscription; requires AC library/ID card).

There is a detailed chronology at the Carl Vinson Institute of Government, The University of Georgia — this is indispensable

Hugh Dorsey, Argument of Hugh M. Dorsey at the Trial of Leo Frank (Atlanta: Johnson-Dallis Company, 1914)

Reuben Arnold, The Trial of Leo Frank, Reuben R. Arnold's Address on the Motion for a New Trial (Baxley, Georgia: Classic Publishing Company, 1915)

The Frank Case: Inside Story of Georgia's Greatest Murder Mystery (Atlanta: Altanta Publishing Co., 1914)

C.P. Connolly, The Truth About the Frank Case (NY: Vail-Ballou, 1915) — Connolly was a former prosecutor in Butte

C.P. Connolly, "The Frank Case," Collier's (December 19, 1914), 6-24 and (December 26, 1914), 18-24

Wytt E. Thompson, A Short Review of the Frank Case (Atlanta: n.n., 1914)

C. Vann Woodward, Tom Watson: Agarian Rebel (NY: Rinehart and Co., 1938) — classic biography of a key figure in the upsurge in anti-semitism in Georgia

Herbert Ashbury, "Hearst Comes to Atlanta," The American Mercury (January 1926), 87-95

Elmer R. Murphy, "A Visit With Leo M. Frank in the Death Cell at Atlanta," Rhodes Colossus (March 1915), 3-12

Watson's Magazine 1914-1915 — see, for example, "The Official Record in the Case of Leo Frank, a Jew Pervert," (September 1915)

The Jeffersonian, 1914-1915

"How Atlanta Cleaned Up," Literary Digest 46 (May 3, 1913) — treats press coverage of the campaign against prostitution in Atlanta

Gene Wiggins, "The Socio-Political Works of Fiddlin' John and Moonshine Kate," Southern Folklore Quarterly 40 (1977)

text of "The Ballad of Little Mary Phagan" as sung by Fiddlin' John Carson + mp3 file of the ballad

Harry G. Lefever, "Prostitution, Politics and Religion: The Crusade Against Vice in Atlanta in 1912," Atlanta Historical Journal 24 (Spring 1980), 7-29

Mark K. Bauman, "Hitting the Sawdust Trail: Billy Sunday's Atlanta Campaign of 1917," Southern Studies 19 (1980), 385-99[?]

William G. McLoughlin, "Billy Sunday and the Working Girl of 1915," Journal of Presbyterian History 54 (Fall 1976), 385-99[?]