Mark Twain's letters to Will Bowen, "my first, & oldest & dearest friend".
APA Citation
Twain, M., Hornberger, T., Bowen, W. (1941). Mark Twain's letters to Will Bowen, "my first, & oldest & dearest friend". Austin: The University of Texas.
MLA Citation
Twain, Mark, 1835-1910, Theodore Hornberger, and William Bowen. Mark Twain's Letters to Will Bowen, "my First, & Oldest & Dearest Friend". Austin: The University of Texas, 1941.
Warning: These citations may not always be complete (especially for serials).