The course of the great River Wolga
MLA
Chantry, John. The Course of the Great River Wolga. 0AD. https://collections.library.yale.edu/catalog/2017524.
APA, 6th edition
Chantry, J. (0 C.E.). The course of the great River Wolga [Engravings, Maps, Prints (Visual works)]. https://collections.library.yale.edu/catalog/2017524.