MLA

Emerson, Ralph Waldo, 1803-1882. The prose works of Ralph Waldo Emerson. 1870 [i. e. 1869]. https://collections.library.yale.edu/catalog/2020680.

APA, 6th edition

Emerson, Ralph Waldo, 1803-1882. (1870 [i. e. 1869])[The prose works of Ralph Waldo Emerson]. https://collections.library.yale.edu/catalog/2020680.