Birch, P. (1975). Thirty games a week: A study of the use of artificial grass pitches in Islington and Hackney. Sports Council.
Lua i Stíl Chicago (17ú heag.)Birch, P. Thirty Games a Week: A Study of the Use of Artificial Grass Pitches in Islington and Hackney. London: Sports Council, 1975.
Lua MLA (8ú heag.)Birch, P. Thirty Games a Week: A Study of the Use of Artificial Grass Pitches in Islington and Hackney. Sports Council, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.