The SS: Hitler's Instrument of Terror: The Full Story From Street Fighters to the Waffen-SS by Gordon Williamson (Motorbooks International, (March 1994), ISBN 0-87938-905-2, ISBN 978-0-87938-905-5).
↑No Wehrmacht or Western equivalent: senior to Standartenführer (Colonel) and below Brigadeführer (Brigadier), it was not considered a general-officer rank.