Retrieved 13 March 2018. ↑ Williams, Holly (2011) "Unleashed: The secret world of Britain's Dominatrixes" in The Independent, 20 November 2011 ↑ Reichert & Lambiase (2003), p. 77 ↑ Tseëlon (2004), p. 75 ↑ "Bruno Zach's 'Riding Crop Girl' hits World Record $150,602 at Bonhams art auction". justcollecting.com. Retrieved 27 June 2015. ↑ "Lot 116 - Bruno Zach 'The Riding Crop' an Impressive Green and Gilt Patinated Bronze". Bonhams.com.