Armstrong, W. H. (1967). Study is hard work (2nd ed.). Harper $ row.
Lua i Stíl Chicago (17ú heag.)Armstrong, William H. Study Is Hard Work. 2nd ed. New York: Harper $ row, 1967.
Lua MLA (9ú heag.)Armstrong, William H. Study Is Hard Work. 2nd ed. Harper $ row, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.