Cita APA (7a ed.)

Skiba, I., & Züger, R. (2009). Barrier-free planning. Birkhäuser.

Cita Chicago Style (17a ed.)

Skiba, Isabella, y Rahel Züger. Barrier-free Planning. Basel: Birkhäuser, 2009.

Cita MLA (8a ed.)

Skiba, Isabella, y Rahel Züger. Barrier-free Planning. Birkhäuser, 2009.