Birks, H., & Willis, K. (2008). Alpines, trees, and refugia in Europe.
Lua i Stíl Chicago (17ú heag.)Birks, H., agus K. Willis. Alpines, Trees, and Refugia in Europe. 2008.
Lua MLA (9ú heag.)Birks, H., agus K. Willis. Alpines, Trees, and Refugia in Europe. 2008.
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