Não informado. (1978). Energy resources and technology. Business Publishers.
Chicago-viite (17. p.)Não informado. Energy Resources and Technology. Silver Spring, Md: Business Publishers, 1978.
MLA-viite (8. p.)Não informado. Energy Resources and Technology. Business Publishers, 1978.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.