Não informado. (1977). Fueloil and oil heat and solar systems. Industry Publications.
Chicago-viite (17. p.)Não informado. Fueloil and Oil Heat and Solar Systems. Cedar Grove, NJ: Industry Publications, 1977.
MLA-viite (8. p.)Não informado. Fueloil and Oil Heat and Solar Systems. Industry Publications, 1977.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.