Cita APA (7a ed.)

Keil, A., & McKenna, C. (2013). Pedestrian bridges: Ramps, walkways, structures. Edition Detail.

Cita Chicago Style (17a ed.)

Keil, Andreas, y Christina McKenna. Pedestrian Bridges: Ramps, Walkways, Structures. Munich: Edition Detail, 2013.

Cita MLA (8a ed.)

Keil, Andreas, y Christina McKenna. Pedestrian Bridges: Ramps, Walkways, Structures. Edition Detail, 2013.