Hoffman, D. R. (1979). The energy-efficient church How to save energy (and money) in your church. The Pilgrim Press.
Chicago-referens (17:e uppl.)Hoffman, Douglas R. The Energy-efficient Church How to Save Energy (and Money) in Your Church. The Pilgrim Press, 1979.
MLA-referens (9:e uppl.)Hoffman, Douglas R. The Energy-efficient Church How to Save Energy (and Money) in Your Church. The Pilgrim Press, 1979.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.