APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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

Let op: Deze citaties zijn niet altijd 100% accuraat.