Ashworth, G. J. (1984). Recreation and tourism. Bell & Hyman.
Lua i Stíl Chicago (17ú heag.)Ashworth, G. J. Recreation and Tourism. London: Bell & Hyman, 1984.
Lua MLA (8ú heag.)Ashworth, G. J. Recreation and Tourism. Bell & Hyman, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.