Europe, Scale 1:1,000,000. Marseilles - Nice, North K 31. & Part K 32.
MLA
Europe, Scale 1:1,000,000. Marseilles - Nice, North K 31. & Part K 32. G.S.G.S., 1943. https://collections.library.yale.edu/catalog/15238344.
APA, 6th edition
Europe, Scale 1:1,000,000. Marseilles - Nice, North K 31. & Part K 32. (1943). [Maps]. G.S.G.S., https://collections.library.yale.edu/catalog/15238344.