The Regency Kingdom has been referred to as a puppet state by Norman Davies in Europe: A history (Google Print, p. 910); by Jerzy Lukowski and Hubert Zawadzki in A Concise History of Poland (Google Print, p. 218); by Piotr J. Wroblel in Chronology of Polish History and Nation and History (Google Print, p. 454); and by Raymond Leslie Buell in Poland: Key to Europe (Google Print, p. 68: „The Polish Kingdom… was merely a pawn [of Germany]“).
U.S. Foreign Policy and National Security: Chronology and Index for the 20th Century Davis:. Santa Barbara, California: Praeger Security International, 2010 — 49-bet. ISBN 978-0-313-38385-4.