Cite

South-eastern Europe [cartographic material] = Europe Sud-est = Südost-Europa.

MLA

Vallier, and Blanc. South-Eastern Europe [Cartographic Material] = Europe Sud-Est = Südost-Europa. Vallier & Blanc, 0AD. https://collections.library.yale.edu/catalog/15509640.

APA, 6th edition

V., & B. (0 C.E.). South-eastern Europe [cartographic material] = Europe Sud-est = Südost-Europa. [Maps]. Vallier & Blanc, https://collections.library.yale.edu/catalog/15509640.