Some good sources on the Confederate assault on Little Round Top:
-Company "E," Fourth Texas, Hood's Brigade by Col. H. B. Simpson
-Hood's Texas Brigade by J. B. Polley (includes several eyewitnesses)
-The Adventures of a Prisoner of War by Decimus Et Ultimus Barziza
-Recollections of a Texas Colonel, by Robert M. Powell
-Letter of Mark Hubert (K/5 TX)
-Southern Bivouac, Camp Fires of the Confederacy (article by u/i Private in H/5 TX)
-Letter of Rufus K. Felder (E/5 TX)
-War Reminiscences by John W. Stevens (K/5 TX)
-Supplement to the Official Reports vol. 68(Cos. C, D, I of 5 TX)
-Letter of Zack Landrum (H/4 TX)
-W. C. Ward's account in Confederate Veteran, 1900 (4 ALA)