National Museums and Galleries of Northern Ireland (2004). "Orchis tridentata". ORCHIDS OF EUROPE WEB SITE. Archived from the original on 2009-03-05. Retrieved 2009-09-24.
National Museums and Galleries of Northern Ireland (2004). "Orchis tridentata". ORCHIDS OF EUROPE WEB SITE. Archived from the original on 2009-03-05. Retrieved 2009-09-24.