Samuel Langhorne Clemens:
some reminiscences and some excerpts from letters and unpublished manuscripts.

APA Citation

Langdon, J., Twain, M. (1910). Samuel Langhorne Clemens: some reminiscences and some excerpts from letters and unpublished manuscripts. [Elmira? N.Y.: s.n..

MLA Citation

Langdon, Jervis, and Mark Twain. Samuel Langhorne Clemens: Some Reminiscences And Some Excerpts From Letters And Unpublished Manuscripts. [Elmira? N.Y.: s.n., 1910.

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