1) Leader-Post Carrier Foundation. 1991. Environmental and Energy Household Hints. Centax Books, Regina, Canada.
2) U.S. Department of Housing and Urban Development. ND. Savings Strategies: Domestic Water-Heating Systems, W8. Install Water-Saving Toilets. Public and Indian Housing. www.hud.gov/offices/pih/programs/ph/phecc/strat_W8.cfm
3) IBID
4) U.S. Department of Housing and Urban Development. ND. Savings Strategies: Domestic Water-Heating Systems, W1. Install Water-Efficient Showerheads and Faucet Aerators. Public and Indian Housing. http://www.hud.gov/offices/pih/programs/ph/phecc/strat_W1.cfm
5) U.S. Department of Housing and Urban Development. ND. Savings Strategies: Domestic Water-Heating Systems, W8. Install Water-Saving Toilets. Public and Indian Housing. Downloaded July, 2003: www.hud.gov/offices/pih/programs/ph/phecc/strat_W8.cfm