Service of the piece 105-mm Howitzer, M 2, truck-drawn - USA Field Artillery Field Manual, FM 6-75 Field artillery : tactics and technique of division artillery and higher artillery echelons - USA War Department Field Manual, FM 6-100 Service of the piece : 155-mm gun M 1 - USA Field Artillery Field Manual, FM 6-90 afv/weapons profile Illustrated summary of German self-propelled weapons 1939-1945 / by Peter Chamberlain and Hilary L. Doyle field manual Armee de l'air : a pictorial history of the French Air Force 1937-1945 / by Paul Camelio & Christopher Shores ; ill. by Don Greer
