International Standard Book Numbers

The ISBN for APA’s 2018 Payroll Source Plus is 978-1-944301-22-4.

The ISBN for APA’s 2018 The Payroll Source® Online is 978-1-944301-23-1.

The ISBN for APA’s 2019 edition of APA’s Guide to Local Payroll Taxes is 978-1-944301-30-9.