MLA
Minutes of Several Conversations between the the [Sic] Reverend Messieurs John and Charles Wesley, and Others. [publisher not identified], 1770. Pitts Theology Library. https://digital.library.emory.edu/purl/938jdfn3qf-cor.
APA, 6th edition
Minutes of several conversations between the the [sic] Reverend Messieurs John and Charles Wesley, and others. (1770). [publisher not identified]; Pitts Theology Library. https://digital.library.emory.edu/purl/938jdfn3qf-cor.
Chicago
“Minutes of Several Conversations between the the [Sic] Reverend Messieurs John and Charles Wesley, and Others.” Wesleyana Collection. London: [publisher not identified], 1770. Pitts Theology Library. https://digital.library.emory.edu/purl/938jdfn3qf-cor.