1. Harper, R.: Inside the Smart Home. Springer, London (2003)
2. Odum, E.P., Odum, H.T., Andrews, J.: Fundamentals of Ecology. Saunders, Philadelphia (1971)
3. Young, G.L.: Human ecology as an interdisciplinary concept: a critical inquiry. Adv. Ecol. Res. 8, 1–105 (1974)
4. Richards, E.H.: Sanitation in Daily Life. Forgotten Books, London (1907)
5. Abercrombie, M., Hickman, C.J., Johnson, M.L.: A Dictionary of Biology. Penguin Reference Books, London (1966)