Biggs, B. (2006). Hedge hogging. Wiley.
Lua i Stíl Chicago (17ú heag.)Biggs, Barton. Hedge Hogging. Hoboken, N.J.: Wiley, 2006.
Lua MLA (8ú heag.)Biggs, Barton. Hedge Hogging. Wiley, 2006.
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