The American claimant :
and other stories and sketches /
by Mark Twain (Samuel L. Clemens)

APA Citation

Twain, M., Letchworth, P., Letchworth, S. (1906). The American claimant: and other stories and sketches. Hillcrest ed. New York: Harper & brothers.

MLA Citation

Twain, Mark, 1835-1910, Pierre Letchworth, and Sarah Letchworth. The American Claimant: And Other Stories And Sketches. Hillcrest ed. New York: Harper & brothers, 1906.

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