Энэ нь Link Таны хэл дээр байхгүй байгаа, Нь харах: English (en),
Эсвэл Google Translate ашиглах:  

http://holmgren.com.au/permaculture/

David Holmgren is regularly involved in teaching on a variety of permaculture courses including the well known Permaculture Design Certificate course. He also offers workshops, and talks at a diverse range of events and venues.