Catholic Encyclopedia - St. Martina, Roman virgin and martyr, d. 226 or (more likely) 228. www.newadvent.org/cathen/09730a.htm
Catholic Online - Brief description of St. Martina. saints.catholic.org/saints/martina.html
For All the Saints - Gives 228 as the year of the saint's death, says that in 1969 her feast was removed from the general Roman calendar but not from local calendars. users.erols.com/saintpat/ss/0130.htm#mart
Lives of the Saints - St. Martina, virgin, martyr. From Fr. Alban Butler's Lives of the Saints. www.ewtn.com/library/MARY/MARTINA.htm
