Revised by: Stephen J. Krass, <1998->
2000 ed. replaces all previous editions.
Published by: Aspen Publishers, <2006->
Previous eds. were monographs with same title, kept up-to-date by cumulative supplements.
Volumes for 1992- have companion volume: Pension answer book. Forms & worksheets.
Latest issue consulted: 2010.
Latest issue consulted: 1999 ed.