Статистические данные по использованию социальных сетей взяты из "Digital в 2019," We Are Social, https://wearesocial.com/global-digital-report-2019
.Идеи малых изменений, ведущих к большим переменам, взяты из Daniel F. Chambliss, "The Mundanity of Excellence: An Ethnographic Report on Stratification and Olympic Swimmers,"
Раздел по воде основан на "Water: Scarcity, Excess, and the Geopolitics of Allocation," Lauder Institute, Wharton School, University of Pennsylvania, 2016, https://lauder.wharton.upenn.edu/life-at-lauder/santander-globalization-trendlab-2016
; Willa Paterson, et al., «Water Footprint of Cities,»О сельском хозяйстве в городах см. Christopher D. Gore, "How African Cities Lead: Urban Policy Innovation and Agriculture in Kampala and Nairobi,"
О возрождении Бильбао см. Herbert Muschamp, "The Miracle in Bilbao,"