1. Ab-in-den-Urlaub-de (2013) Studie: Kleingärten in Deutschland. www.ab-in-den-urlaub.de/.../studie-532-557-kleingarten-in-den-131-grosten-stadten-deutschlands-spitzenreiter-ist-berlin-leipzig-hamburg-und. Accessed 16 March 2018
2. Aevermann T, Schmude J (2015) Quantification and monetary valuation of urban ecosystem services in Munich, Germany. Z Wirtschaftsgeographie 59(3):188–200
3. Alleyne A (2017) China unveils plans for world’s first pollution-eating ‘Forest City’. www.cnn.com/style/article/china-liuzhou-forest-city/index.html. Accessed 9 March 2018
4. Annerstedt M, Ostergren P-O, Bjork J, Grahn P, Skarback E, Wahrborg P (2012) Green qualities in the neighbourhood and mental health – results from a longitudinal cohort study in Southern Sweden. BMC Public Health 12:337
5. Anstiftung (Hrsg) (2018) Offene Werkstätten, Reparatur-Initiativen, Interkulturelle und Urbane Gemeinschaftsgärten. https://anstiftung.de/.../1417-erste-schritte-wie-baue-ich-einen-interkulturellen-gemeinschaftsgarten-auf. Accessed 17 March 2018