Holmgren, D. (2002). Permaculture: Principles and pathways beyond sustainability. Holmgren design services.
Lua i Stíl Chicago (17ú heag.)Holmgren, David. Permaculture: Principles and Pathways Beyond Sustainability. Victoria: Holmgren design services, 2002.
Lua MLA (9ú heag.)Holmgren, David. Permaculture: Principles and Pathways Beyond Sustainability. Holmgren design services, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.