| year of publication | ISBN | author(s) | title |
|---|---|---|---|
| 2008 | 978-1-934951-01-9 | American Payroll Association | Payroll Practice Fundamentals |
| 2009 | 978-1-934951-12-5 | Michael P. O'Toole | The Payroll Source |
| 2010 | 978-1-934951-25-5 | American Payroll Association | Payroll Practice Fundamentals |
| '' | 978-1-934951-26-2 | Michael P. O'Toole · Esq. | The Payroll Source |
| 2015 | 978-1-934951-81-1 | Michael P. O'Toole · Esq. | The Payroll Source |
| '' | 978-1-934951-83-5 | American Payroll Association | Federal Payroll Tax Laws & Regulations |
| '' | 978-1-934951-86-6 | '' | APA's Guide to Federal and State Wage & Hour Laws |
| '' | 978-1-934951-88-0 | '' | The Guide to Successful Electronic Payments |