1. Akerblom, P. (2004). Footprints of school gardens in Sweden. Garden History, 32(2), 229–247.
2. Aridi, S. (2015). Resource overdraft: Planet Earth crosses into ecological red. Retrieved from http://www.csmonitor.com/Environment/2015/0814/Resource-overdraft-Planet-Earth-crosses-into-ecological-red
3. Bailey, L. H. (1909). The nature-study idea: An interpretation of the new school-movement to put the young into relation and sympathy with nature Retrieved from https://archive.org/stream/naturestudyideai1909bail
4. Beaumont, L. (2002). Losing the plot? Landscape New Zealand, 12–16 Sept/Oct.
5. Birdsall, S. (2014). Analysing teachers’ translation of sustainability using a PCK framework. Environmental Education Research, 1–24. doi:10.1080/13504622.2014.93377.