APA (7th ed.) Citation

Allen, H. T. (1923). My Rhineland journal. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Allen, Henry T. My Rhineland Journal. Boston: Houghton Mifflin, 1923.

MLA (9th ed.) Citation

Allen, Henry T. My Rhineland Journal. Houghton Mifflin, 1923.