Goodman, P. S. (1984). Absenteeism. Jossey-Bass.
Lua i Stíl Chicago (17ú heag.)Goodman, Paul S. Absenteeism. San Francisco: Jossey-Bass, 1984.
Lua MLA (9ú heag.)Goodman, Paul S. Absenteeism. Jossey-Bass, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.