APA (7e ed.) Bronvermelding

(1970). Horst Janssen: Picture Book ; A selection of 12 coloured drawings from the exhibition at Marlborough Fine Art (London). Marlborough Fine Art.

Chicago (17e ed.) Bronvermelding

Horst Janssen: Picture Book ; A Selection of 12 Coloured Drawings from the Exhibition at Marlborough Fine Art (London). London: Marlborough Fine Art, 1970.

MLA (8e ed.) Bronvermelding

Horst Janssen: Picture Book ; A Selection of 12 Coloured Drawings from the Exhibition at Marlborough Fine Art (London). Marlborough Fine Art, 1970.