APA (7th ed.) Citation

Armstrong, W. H. (1967). Study is hard work (2nd ed.). Harper $ row.

Chicago Style (17th ed.) Citation

Armstrong, William H. Study Is Hard Work. 2nd ed. New York: Harper $ row, 1967.

MLA (9th ed.) Citation

Armstrong, William H. Study Is Hard Work. 2nd ed. Harper $ row, 1967.