Cita APA (7th ed.)

Robert H. M. & Collins, J. H. (2009). Handbook of energy conservation. Alkem.

Cita Chicago (17th ed.)

Robert H. M. i J. H. Collins. Handbook of Energy Conservation. Singapore: Alkem, 2009.

Cita MLA (9th ed.)

Robert H. M. i J. H. Collins. Handbook of Energy Conservation. Alkem, 2009.