MLA

Jackson, William Henry, 1843-1942. [No. 1021. Rio de los Pinos, (Rio San Antonio) and rock formations in the Toltec Gorge, Rio Arriba County, New Mexico. Shows a Denver and Rio Grande Railroad train near the Toltec tunnel high on the rock cliff]. Folder 52. 1878-1898. https://collections.library.yale.edu/catalog/2016827.

APA, 6th edition

Jackson, William Henry, 1843-1942. (["Folder 52"])(1878-1898)[[No. 1021. Rio de los Pinos, (Rio San Antonio) and rock formations in the Toltec Gorge, Rio Arriba County, New Mexico. Shows a Denver and Rio Grande Railroad train near the Toltec tunnel high on the rock cliff]]. https://collections.library.yale.edu/catalog/2016827.