British Bat Survey – National Bat Monitoring Programme – Bat Conservation Trust
https://naturstyrelsen.dk/media/nst/Attachments/FLAGERMUS_forvaltningsplan_2013_FinalCut2.pdf
AudioMoth | UK | Open Acoustic Devices
Danmarks Naturfredningsforening Sønderborg – Sønderborg
https://www.batconservationireland.org/
https://www.batsurvey.org/wp-content/uploads/VisualDeterminationOfMyotis.pdf
http://www.sweden.chiroptera.se/