Staple, P. (2007). Look behind us, a blue sky: Johanna Billing. Hatje Cantz.
Chicagoスタイル(17版)引用形式Staple, Polly. Look Behind Us, a Blue Sky: Johanna Billing. Ostfildern: Hatje Cantz, 2007.
MLA(8版)引用形式Staple, Polly. Look Behind Us, a Blue Sky: Johanna Billing. Hatje Cantz, 2007.
警告: この引用は必ずしも正確ではありません.