Cita APA (7th ed.)

Staple, P. (2007). Look behind us, a blue sky: Johanna Billing. Hatje Cantz.

Cita Chicago (17th ed.)

Staple, Polly. Look Behind Us, a Blue Sky: Johanna Billing. Ostfildern: Hatje Cantz, 2007.

Cita MLA (8th ed.)

Staple, Polly. Look Behind Us, a Blue Sky: Johanna Billing. Hatje Cantz, 2007.