A journal of the plague year :
being observations or memorials of the most remarkable occurrences, as well publick as private, which happened in London during the last great visitation in 1665 : written by a citizen who continued all the while in London : never made publick before /
by Daniel Defoe ; with an introduction by Henry Morley.

APA Citation

Defoe, D. (1886). A journal of the plague year: being observations or memorials of the most remarkable occurrences, as well publick as private, which happened in London during the last great visitation in 1665 : written by a citizen who continued all the while in London : never made publick before. 2nd ed. London: George Routledge & Sons.

MLA Citation

Defoe, Daniel, 1661?-1731. A Journal of the Plague Year: Being Observations Or Memorials of the Most Remarkable Occurrences, As Well Publick As Private, Which Happened In London During the Last Great Visitation In 1665 : Written by a Citizen Who Continued All the While In London : Never Made Publick Before. 2nd ed. London: George Routledge & Sons, 1886.

Warning: These citations may not always be complete (especially for serials).