Extract of Mezieres-Verdun-Metz-Longwy : Meuse-Argonne offensive, map showing daily position of front line Map room G-3, G.H.Q. May 24, 1919.
MLA
Extract of Mezieres-Verdun-Metz-Longwy : Meuse-Argonne Offensive, Map Showing Daily Position of Front Line Map Room G-3, G.H.Q. May 24, 1919. Engineer Reproduction plant, U.S. Army, 1921. https://collections.library.yale.edu/catalog/15238008.
APA, 6th edition
Extract of Mezieres-Verdun-Metz-Longwy : Meuse-Argonne offensive, map showing daily position of front line Map room G-3, G.H.Q. May 24, 1919. (1921). [Maps]. Engineer Reproduction plant, U.S. Army, https://collections.library.yale.edu/catalog/15238008.