"The First Bullet That Hit," Warren Commission Report, p. 106. This figure was incorrectly reported by author Vincent Bugliosi, in Reclaiming History (p. 460) as 3.9 degrees; as a decimal number it is actually 3.15 degrees.
Lattimer, JK; Laidlaw, A; Heneghan, P; Haubner, EJ (1994). "Experimental duplication of the important physical evidence of the lapel bulge of the jacket worn by Governor Connally when bullet 399 went through him". Journal of the American College of Surgeons. 178 (5): 517–22. PMID8167893.