APA (7e ed.) Bronvermelding

Não informado. (2018). The Penrose Graphic Arts International Annual. Lund Humphries.

Chicago (17e ed.) Bronvermelding

Não informado. The Penrose Graphic Arts International Annual. London: Lund Humphries, 2018.

MLA (8e ed.) Bronvermelding

Não informado. The Penrose Graphic Arts International Annual. Lund Humphries, 2018.

Let op: Deze citaties zijn niet altijd 100% accuraat.