Fig.4. Branch, leaves, male flowers, and fruit of O. chrysophylla, natural size. [and] Fig. 4a. Nut of C. chrysophylla, natural size. [Illustrations on page 26 of REPORTS VOL. 6.]
MLA
Fig.4. Branch, Leaves, Male Flowers, and Fruit of O. Chrysophylla, Natural Size. [and] Fig. 4a. Nut of C. Chrysophylla, Natural Size. [Illustrations on Page 26 of REPORTS VOL. 6.]. 0AD. https://collections.library.yale.edu/catalog/2016593.
APA, 6th edition
Fig.4. Branch, leaves, male flowers, and fruit of O. chrysophylla, natural size. [and] Fig. 4a. Nut of C. chrysophylla, natural size. [Illustrations on page 26 of REPORTS VOL. 6.]. (0 C.E.). [Relief prints, Wood engravings]. https://collections.library.yale.edu/catalog/2016593.