Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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