The sources used are:

* Armees Militaria
* Bundesarchive
* Concord Pub.
* Fine Scale Modeler
* Historie & Collectors
* Osprey Military
* Salamander Pub.
* Salvat Pub.
* Signal/Squadron
* Time Life Pub.
* U.S. Archive
* Waffen-Arsenal

RTV it recommend highly the Publications of these Firms