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]").
Davis, Robert T., επιμ. (2010). U.S. Foreign Policy and National Security: Chronology and Index for the 20th Century. 1. Santa Barbara, California: Praeger Security International. σελ. 49. ISBN978-0-313-38385-4.
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Mukhtar, Mohammed (25 Φεβρουαρίου 2003). Historical Dictionary of Somalia. Scarecrow Press. σελ. 126. Ανακτήθηκε στις 28 Φεβρουαρίου 2017.