Pilgert, H. P. (1951). The history of the development of information services through information centers and documentary films. Office of the U.S. High Commissioner for Germany, Historical Division, Office of the Executive Secretary.

Pilgert, Henry P. The History of the Development of Information Services Through Information Centers and Documentary Films. Bad Godesberg: Office of the U.S. High Commissioner for Germany, Historical Division, Office of the Executive Secretary, 1951.

Pilgert, Henry P. The History of the Development of Information Services Through Information Centers and Documentary Films. Office of the U.S. High Commissioner for Germany, Historical Division, Office of the Executive Secretary, 1951.