1. Bringslimark T (2007) Psychological benefits of nature in the indoor context. PhD Thesis, Norwegian University of Life Sciences
2. Building Information Group (2011) Classification of indoor environment 2008. Target values, design guidance, and product requirements. Rakennustieto OY. http://kauppa.rakennustieto.fi/en/productcard.asp?productid=104537 . Accessed 5 May 2011
3. Cold B (2001) Aesthetics, well-being and health. Essays within architecture and environmental aesthetics. Ashgate Publishing Limited, Aldershot
4. Kellert SR (2005) Building for life: understanding and designing the human-nature connection. Island Press, Washington
5. Norlén U, Andersson K (1993) Indoor climate in homes. ELIB Report 7 TN:30. Statens Institut för Byggnadsforskning, Gävle (in Swedish: Bostadsbeståndets inneklimat)