Formal Methods and Service Specification. - Mícheál Mac an Airchinnigh; Dag Belsnes; Gerard O'Regan (IS&N, 1994)

A practical approach to software quality. - Gerard O'Regan (Springer, 2002)

Mathematical approaches to software quality. - Gerard O'Regan (Springer, 2006)

A Brief History of Computing. - Gerard O'Regan (Springer, 2008)

Introduction to Software Process Improvement. - Gerard O'Regan (Springer, 2011)

A Brief History of Computing, Second Edition. - Gerard O'Regan (Springer, 2012)

Mathematics in Computing - an Accessible Guide to Historical, Foundational and Application Contexts. - Gerard O'Regan (Springer, 2013)

Giants of Computing - A Compendium of Select, Pivotal Pioneers. - Gerard O'Regan (Springer, 2013)

Introduction to Software Quality - Gerard O'Regan (Springer, 2014)

Pillars of Computing: A Compendium of Select, Pivotal Technology Firms - Gerard O'Regan (Springer, 2015)

Guide to Discrete Mathematics - An Accessible Introduction to the History, Theory, Logic and Applications - Gerard O'Regan (Springer, 2016)

Introduction to the History of Computing - A Computing History Primer - Gerard O'Regan (Springer, 2016)

Concise Guide to Software Engineering - From Fundamentals to Application Methods - Gerard O'Regan (Springer, 2017)

Concise Guide to Formal Methods - Theory, Fundamentals and Industry Applications - Gerard O'Regan (Springer, 2017)

The Innovation in Computing Companion - A Compendium of Select, Pivotal Inventions - Gerard O'Regan (Springer, 2018)

World of Computing: A Primer Companion for the Digital Age - Gerard O'Regan (Springer, 2018)

Concise Guide to Software Testing - Gerard O'Regan (Springer, 2019)

Mathematics in Computing - An Accessible Guide to Historical, Foundational and Application Contexts, Second Edition - Gerard O'Regan (Springer, 2020)

A Brief History of Computing, Third Edition - Gerard O'Regan (Springer, 2021)

Guide to Discrete Mathematics - An Accessible Introduction to the History, Theory, Logic and Applications, Second Edition - Gerard O'Regan (Springer, 2021)

Concise Guide to Software Engineering - From Fundamentals to Application Methods, Second Edition - Gerard O'Regan (Springer, 2022)

Mathematical Foundations of Software Engineering - A Practical Guide to Essentials - Gerard O'Regan (Springer, 2023)

Ethical and Legal Aspects of Computing - A Professional Perspective from Software Engineering - Gerard O'Regan (Springer, 2024)

Guide to Software Project Management - Gerard O'Regan (Springer, 2025)