APA (7th ed.) Zitazioa

Holmgren, D. (2002). Permaculture: Principles and pathways beyond sustainability. Holmgren design services.

Chicago Style (17th ed.) Zitazioa

Holmgren, David. Permaculture: Principles and Pathways Beyond Sustainability. Victoria: Holmgren design services, 2002.

MLA (9th ed.) Zitazioa

Holmgren, David. Permaculture: Principles and Pathways Beyond Sustainability. Holmgren design services, 2002.