Kehnel, A., & Ipsen, G. (2024). The green ages: Medieval innovations in sustainability. Brandeis University Press.
Lua i Stíl Chicago (17ú heag.)Kehnel, Annette, agus Gesche Ipsen. The Green Ages: Medieval Innovations in Sustainability. Waltham, Massachusetts: Brandeis University Press, 2024.
Lua MLA (9ú heag.)Kehnel, Annette, agus Gesche Ipsen. The Green Ages: Medieval Innovations in Sustainability. Brandeis University Press, 2024.
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