Harris, D. (2009). Key concepts in leisure studies. Sage.
Lua i Stíl Chicago (17ú heag.)Harris, David. Key Concepts in Leisure Studies. Sage, 2009.
Lua MLA (8ú heag.)Harris, David. Key Concepts in Leisure Studies. Sage, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.