- Hardy Ferns, Akron Ohio [us]
- Kirstins Bregner, Kirstin Nørgaard Pedersen Beder [dk]
- Fernatic, Le site des passionnés de fougeres [fr]
- No seeds, no fruits, no flowers: no problem. Adventures in fern biology / Emily Y. Butler [us]
- The Platycerium site Louwrens Opperman and Roy Vail [za]
- Andrew Leonard’s Fern Site Andrew Lenard [uk]
- Cold Hardy Tree Ferns Ian Barclay [us]
- New Zealand ferns book 1877 Eric Craig [uk]
