Finding Your Irish Ancestors, 4th Edition by Dr. Penelope Christensen, Ph.D.; 177 pg; Comb bound; 5.5x8.5; Revised 2007; ISBN: 978-1894018036; Item # HI01
The 4 Primary Sources and the most reliable ones are all obtainable at Family History Centers.
This book presents a sound strategy for thorough and productive research.