International Standard Book Numbers

The ISBN for APA’s 2018 Payroll Source Plus is 978-1-944301-33-0.

The ISBN for APA’s 2018 The Payroll Source® Online is 978-1-944301-40-8.

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