MLA

King, T. Butler (Thomas Butler), 1800-1864, Taylor, Bayard, 1825-1878. Eldorado : or, Adventures in the path of empire: comprising a voyage to California, via Panama; life in San Francisco and Monterey; pictures of the gold region, and experiences of Mexican travel / By Bayard Taylor. With illustrations by the author.. 1850. https://collections.library.yale.edu/catalog/12369681.

APA, 6th edition

King, T. Butler (Thomas Butler), 1800-1864, & Taylor, Bayard, 1825-1878. (1850)[Eldorado : or, Adventures in the path of empire: comprising a voyage to California, via Panama; life in San Francisco and Monterey; pictures of the gold region, and experiences of Mexican travel / By Bayard Taylor. With illustrations by the author.]. https://collections.library.yale.edu/catalog/12369681.