Birks, H., & Willis, K. (2008). Alpines, trees, and refugia in Europe.
Cita Chicago (17th ed.)Birks, H., i K. Willis. Alpines, Trees, and Refugia in Europe. 2008.
Cita MLA (9th ed.)Birks, H., i K. Willis. Alpines, Trees, and Refugia in Europe. 2008.
Atenció: Aquestes cites poden no estar 100% correctes.