1. ASHRAE (American Society for Heating, Refrigeration, and Air-Conditioning Engineers): (2001). ANSI ASHRAE Standard 62-2001, Ventilation for acceptable Indoor Air Quality. Atlanta: ASHRAE Inc., GA, USA.
2. Atwell, B., Kriedemann, P., & Turnbull, C. (eds) (1999a). Plants in Action, Adaptation in Nature, Performance in Cultivation (pp 383–392). Melbourne, Australia: Macmillan Education Australia Pty Ltd.
3. Atwell, B. et al. (eds) (1999) (b) Ibid., 460–468.
4. Bergs, J. (2002). The effect of healthy workplaces on the well-being and productivity of office workers. In: Proceedings of International Plants for People Symposium, Floriade, Amsterdam, NL, June, 2002, Flower Council of Holland, NL.
5. Brasche, S., Bullinger, M., Gebhardt, H., Herzog, V., Hornung, P., Kruppa, B., Meyer, E., Morfield, M., Schwab, R. V., Mackensen, S., Winkens, A. & Bischof, W. (1999). Factors determining different symptom patterns of sick building syndrome—results from a multivariate analysis. In: Proceedings of Indoor Air '99. The 8th International Conference on Indoor Air Quality and Climate, August, 1999, Edinburgh, Scotland, August, UK, 5, 402–407.