Cita APA (7a ed.)

Hassell, C., Coombes, B., Carwardine, H., & Butcher, K. (2007). Green roofs. Chartered Institution of Building Services Engineers.

Cita Chicago Style (17a ed.)

Hassell, Cath, Ben Coombes, Helen Carwardine, y Ken Butcher. Green Roofs. London: Chartered Institution of Building Services Engineers, 2007.

Cita MLA (8a ed.)

Hassell, Cath, et al. Green Roofs. Chartered Institution of Building Services Engineers, 2007.