Barry, T. (1994). Excellence is a habit: How to avoid quality burnout. Ben Johnston.
Lua i Stíl Chicago (17ú heag.)Barry, Thomas. Excellence Is a Habit: How to Avoid Quality Burnout. New delhi: Ben Johnston, 1994.
Lua MLA (9ú heag.)Barry, Thomas. Excellence Is a Habit: How to Avoid Quality Burnout. Ben Johnston, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.