Johnson, Oliver (2015). "A splash in North America". Vertical Magazine, Heli-Expo news. p. 44. Archived from the original on 19 April 2015. Retrieved 11 April 2015.
Johnson, Oliver (2015). "A splash in North America". Vertical Magazine, Heli-Expo news. p. 44. Archived from the original on 19 April 2015. Retrieved 11 April 2015.