81 mm moździerz Mle 27/31 Brandt (Polish Wikipedia)

Analysis of information sources in references of the Wikipedia article "81 mm moździerz Mle 27/31 Brandt" in Polish language version.

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Part Four, Howitzer Company. 3-inch Trench Mortar. W: Basic Field Manual. T. III: Basic Weapons. United States War Department, 1932, s. 20-21.
John Norris: Infantry Mortars of World War II. Oxford: Osprey Publishing, 2002, s. 20. ISBN 978-1841764146.