APA-ийн эшлэл(7 дахь хэвлэлт)

Kehnel, A., & Ipsen, G. (2024). The green ages: Medieval innovations in sustainability. Brandeis University Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Kehnel, Annette, ба Gesche Ipsen. The Green Ages: Medieval Innovations in Sustainability. Waltham, Massachusetts: Brandeis University Press, 2024.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Kehnel, Annette, ба Gesche Ipsen. The Green Ages: Medieval Innovations in Sustainability. Brandeis University Press, 2024.