MLA

Ducher et Cie Editeurs, Imp. Lemercier at Cie, and Lebel sc. Annexes. Elargissement Du Pont d'Iena. Pl. 34. 0AD. https://collections.library.yale.edu/catalog/2021526.

APA, 6th edition

Ducher et Cie Editeurs, I. L. at C., & sc, L. (0 C.E.). Annexes. Elargissement du pont d'iena. pl. 34 [Architectural drawings, Building plans, Engravings, Prints (Visual works)]. https://collections.library.yale.edu/catalog/2021526.