Powers, A. (1999). Nature in design. Conran Octopus.
Cita Chicago (17th ed.)Powers, Alan. Nature in Design. London: Conran Octopus, 1999.
Cita MLA (9th ed.)Powers, Alan. Nature in Design. Conran Octopus, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.