The author referred to the guidebook around Bornholm written by Marcin Jakubowski, itinerary for cyclists "Bicycle routes on Bornholm" written by Stuart Goodale, many brochures, publications and data of The County of Bornholm, Bornholms Velkomstcenter and Destination Bornholm - a tourism marketing office, as well as her own experiences and remarks. Most of the materials were written in English, however the guidebook by Marcin Jakubowski was in Polish and all of the data were in Danish. Most of the photos and the main itinerary are author's own.