The Hole, New York
Acquired from the above by the present owner
'Abstract Paintings By Brock, Pionkowski, Robarts, Sonne & Stone at The Hole, VOLTA 10', Shine 23, 13 June 2014, online (illustrated)
Marina Cashdan, 'Up and Coming: How Kasper Sonne is Setting the Art Wold on Fire', Artsy, 23 July 2014, online (series listed)
Marco Meneguzzo, 'Kasper Sonne: Brand New Gallery', Artforum, vol. 53, no. 3, October 2014, p. 292 (series listed)