Jung book

Hermann Jung: Die Ardennen- Offensive 1944/45. Ein Beispiel für die Kriegführung Hitlers

good overview on the battle of the Ardennes.

one more book

Franz Josef Strauss: Geschichte Der 2.(Wiener) Panzerdivision

Some very interesting thing about this division near Bastogne.

US army maps and Russian general staff maps

for the map:

http://www.lib.utexas.edu/maps/ams/western_europe/

 http://loadmap.net/en

These maps will be the base for the Bastogne map. As we see the elevation are available, there WWII maps to check the changes, and these are the maps to use.
All of them should be georeferenced and loaded to manifold and the mapmaking can be started.
 

a webpage

http://upload.wikimedia.org/wikipedia/en/e/e2/McAuliffeBastogneChristmasLetter101Airborne.jpg

McAuliffe Christmas Letter.

Henning book

Otto Henning: Als Panzer- und Spaehtruppführer in der Panzer-Lehr-Division 1943-1945 (Flechsig)

some pages about the Lehr Division recon battalion around Bastogne.

one more book

John S.D.Eisenhower: The Bitter Woods (G.P.Putnam's Sons, 1969)

Some high level insight, but mostly known sources.

a German language book

Franz Kurowski: Die Panzer-Lehr-Division 1944-1945 (Dörfer-Verlag)

A very good sourced book (mostly memoires of the soldiers of the division.