10. Dolenni Defnyddiol
- Action for swifts www.actionforswifts.com/nestsites.htm
- Bat Conservation Trust www.bats.org.uk
- Barn Owl Trust www.barnowltrust.org.uk
- Black Redstarts - http://www.blackredstarts.org.uk
- Building Research Establishment (BRE) www.bre.co.uk/sustainable
- The Butterfly Conservation www.butterfly-conservation.org
- Centre for Alternative Technology www.cat.org.uk
- COFNOD www.cofnod.org.uk
- Cyngor Bwrdeistref Sirol Conwy www.conwy.gov.uk
- BAP Conwy http://www.conwy.gov.uk/sectionextra.asp?cat=1361&Language=1an
- Cyngor Sir Ddinbych www.denbighshire.gov.uk
- Bioamrywiaeth Cyngor Sir Ddinbych http://www.biodiversityindenbighshire.co.uk
- Energy Efficiency Best Practice Programme www.energy-efficiency.gov.uk
- Joint Nature Conservation Committee www.jncc.gov.uk
- Living Roofs www.livingroofs.org
- London’s Swifts http://www.londons-swifts.org.uk
- Yr Ymddiriedolaeth Genedlaethol www.nationaltrust.org.uk
- Ymddiriedolaeth Bywyd Gwyllt Gogledd Cymru www.northwaleswildlifetrust.org.uk 376 Y Stryd Fawr , Bangor, Gwynedd LL571YE. Ffôn 01248 351541
- Polisi Cynllunio Cymru http://wales.gov.uk/topics/planning/policy/ppw2010/?lang=cy
- Renewable Energy CCA, Energy Savings Trust www.est.org.uk
- Renewable Energy www.dti.gov.uk/renewables
- CFGA www.rspb.org.uk
- Sustainable Homes www.sustainablehomes.co.uk
- UK BAP www.ukbap.org.uk
- Llywodraeth Cynulliad Cymru www.wales.gov.uk