Birch, P. (1975). Thirty games a week: A study of the use of artificial grass pitches in Islington and Hackney. Sports Council.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBirch, P. Thirty Games a Week: A Study of the Use of Artificial Grass Pitches in Islington and Hackney. London: Sports Council, 1975.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBirch, P. Thirty Games a Week: A Study of the Use of Artificial Grass Pitches in Islington and Hackney. Sports Council, 1975.
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