(1970). Horst Janssen: Picture Book ; A selection of 12 coloured drawings from the exhibition at Marlborough Fine Art (London). Marlborough Fine Art.
Lua i Stíl Chicago (17ú heag.)Horst Janssen: Picture Book ; A Selection of 12 Coloured Drawings from the Exhibition at Marlborough Fine Art (London). London: Marlborough Fine Art, 1970.
Lua MLA (8ú heag.)Horst Janssen: Picture Book ; A Selection of 12 Coloured Drawings from the Exhibition at Marlborough Fine Art (London). Marlborough Fine Art, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.