Alexander Lamis; Andrew Doyle; Charles Reagan Wilson; Charles S. Bullock Iii; Dana F. White LUP - University of Georgia Press 2005 Pehmeäkantinen kirja
Morral, Andrew R; Price, Carter C; Ortiz, David S; Wilson, Bradley; Latourrette, Tom; Mobley, Blake W; McKay, Shawn; Willis, Hen RAND Corporation 2012 Pehmeäkantinen kirja