"Sopranos: Mary Hegarty". musichall.uk.com. Archived from the original on 30 June 2016. https://web.archive.org/web/20160630120406/http://www.musichall.uk.com/artist.aspx?artist=8&name=Mary%20Hegarty&category=
"My Life, Love, Ups And Downs... And Why I'm Becoming Jazz Singer". eveningecho.ie. Archived from the original on 20 April 2016. https://web.archive.org/web/20160420062622/http://www.eveningecho.ie/wow/my-life-love-ups-and-downs-and-why-im-becoming-jazz-singer/1132503/
"Soprano Mary Hegarty sings for St Coleman's". The Corkman. 7 May 2009. http://www.independent.ie/regionals/corkman/news/soprano-mary-hegarty-sings-for-st-colemans-27069887.html
"Noriko Kawai (piano), Mary Hegarty (soprano), Ulster Orchestra/Thierry Fischer". Irish Times. 5 June 2000. http://www.irishtimes.com/news/noriko-kawai-piano-mary-hegarty-soprano-ulster-orchestra-thierry-fischer-1.278816
Smith, Gus (1994). Irish Stars of the Opera. Dublin: Madison Publishers. pp. 305–313.
"Sopranos: Mary Hegarty". musichall.uk.com. Archived from the original on 30 June 2016. https://web.archive.org/web/20160630120406/http://www.musichall.uk.com/artist.aspx?artist=8&name=Mary%20Hegarty&category=