- http://keyholefarms.com/ (Dead Link)
- http://www.sendacow.org.uk/keyhole-gardens (Original Dead Link)
- There wasn't a snapshot on the day of the link's posting, so here are the ones on either side of that date
- The Closest Wayback Machine Snapshot Before the Original Post's Edit Date
- The Closest Wayback Machine Snapshot After the Original Post's Edit Date
- This may be the modern version?