There are 1 book by Ken O'brien on BookOrb. A strong starting point is Payroll and Taxation for Employers (2000). The bibliography below is in publication order, with series grouped in reading order.
Standalone books
Frequently asked questions
How many books has Ken O'brien written?
BookOrb lists 1 book by Ken O'brien.
Where should I start with Ken O'brien?
A good starting point is Payroll and Taxation for Employers (2000).
What is the Ken O'brien books in order list?
In publication order: 1. Payroll and Taxation for Employers (2000).