The hour of opportunity,
by Orison Swett Marden, with the assistance of Abner Bayley.
Marden, O. Swett., Bayley, A. (1900). The hour of opportunity. New York: T.Y. Crowell & co.
Marden, Orison Swett, 1848-1924, and Abner Bayley. The Hour of Opportunity. New York: T.Y. Crowell & co, 1900.
Warning: These citations may not always be complete (especially for serials).