Cite

239. [Engelmann Spruce ( Picea engelmannii) at Dusk.]

MLA

McClintock, Walter, 1870-1949. 239. [Engelmann Spruce ( Picea engelmannii) at Dusk.]. Box 61, folder 3067. 1938. https://collections.library.yale.edu/catalog/2008551.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 61, folder 3067"])(1938)[239. [Engelmann Spruce ( Picea engelmannii) at Dusk.]]. https://collections.library.yale.edu/catalog/2008551.