The book 'Web Survey Methodology' was published by Sage in 2015, by Mario Callegaro, PhD, from Google and Katja Lozar Manfreda, PhD, and Vasja Vehovar, PhD, from UL, Faculty of Social Sciences, Centre for Social Informatics. It has become the leading monograph in the field of web survey methodology. As the authors declined to revise the book as second edition, based on the agreement with Sage, the authors regained the copyrights, so the book is now publicly available in PDF and EPUB3 formats.