Ancestry.com. History of O'Mullally and Lally clan [database on-line]. Provo, UT: Ancestry.com Operations Inc, 2005.Original data: O'Mullally, Dennis Patrick,. History of O'Mullally and Lally clan, or, The history of an Irish family through the ages entertwined with that of the Irish nation. Chicago, Ill.: Printed by Mid-West Printers & Publishers, c1941.