MLA

Stevenson, Robert Louis, 1850-1894. Kidnapped : being memoirs of the adventures of David Balfour / written by himself, and now set forth by Robert Louis Stevenson .... [1886]. https://collections.library.yale.edu/catalog/10189466.

APA, 6th edition

Stevenson, Robert Louis, 1850-1894. ([1886])[Kidnapped : being memoirs of the adventures of David Balfour / written by himself, and now set forth by Robert Louis Stevenson ...]. https://collections.library.yale.edu/catalog/10189466.