6. Artifice: A Novel (Marshall Cavendish, 2023), 192pp.

5. I, Huckleberry (Marshall Cavendish, 2020), 248pp.

4. Codes, Puzzles and Conundrums: Mental Challenges for Curious Minds (Marshall Cavendish, 2018), 109pp.

3. Being Arcadia (Marshall Cavendish, 2018), 224pp.

2. Finding Arcadia (Marshall Cavendish, 2017), 256pp.

1. Raising Arcadia (Marshall Cavendish, 2016), 240pp.


Authored Non-Fiction

10. We, the Robots? Regulating Artificial Intelligence and the Limits of the Law (Cambridge University Press, 2021), 289pp.

9. Law and Practice of the United Nations: Documents and Commentary (with Ian Johnstone and David M. Malone) (2nd edn; Oxford University Press, 2016), 741pp.

8. From Community to Compliance? The Evolution of Monitoring Obligations in ASEAN (Cambridge University Press, 2015), 180pp.

7. One Nation Under Surveillance: A New Social Contract to Defend Freedom Without Sacrificing Liberty (Oxford University Press, 2011), 297pp.

6. Law and Practice of the United Nations: Documents and Commentary (with Thomas M. Franck and David M. Malone) (1st edn; Oxford University Press, 2008), 648pp.

5. Shared Secrets: Intelligence and Collective Security (Lowy Institute for International Policy, 2006), 103pp.

4. Studying Law at University (with Clare Rhoden) (2nd edn; Allen & Unwin, 2005), 172pp.

3. You, The People: The United Nations, Transitional Administration, and State-Building (Oxford University Press, 2004), 296pp.

2. Just War or Just Peace? Humanitarian Intervention and International Law (Oxford University Press, 2001), 295pp.

1. Studying Law at University (with Clare Rhoden) (1st edn; Allen & Unwin, 1998), 176pp.


Edited Non-Fiction

11. Law and Technology in Singapore (with Goh Yihan and Andrew Phang Boon Leong) (Academy Publishing, 2021), 671pp.

10. The Oxford Handbook of International Law in Asia and the Pacific (with Hisashi Owada and Ben Saul) (Oxford University Press, 2019), 855pp.

9. The Oxford Handbook of United Nations Treaties (with David M. Malone and Santiago Villalpando) (Oxford University Press, 2019), 716pp.

8. Data Protection Law in Singapore: Privacy and Sovereignty in an Interconnected World (2nd edn; Academy Publishing, 2018), 587pp.

7. Data Protection Law in Singapore: Privacy and Sovereignty in an Interconnected World (1st edn; Academy Publishing, 2014), 313pp.

6. Private Security, Public Order: The Outsourcing of Public Functions and Its Limits (with Angelina Fisher) (Oxford University Press, 2009), 247pp.

5. From Mercenaries to Market: The Rise and Regulation of Private Military Companies (with Chia Lehnardt) (Oxford University Press, 2007), 287pp.

4. Secretary or General? The UN Secretary-General in World Politics (Cambridge University Press, 2007), 280pp.

3. After Mass Crime: Rebuilding States and Communities (with Béatrice Pouligny and Albrecht Schnabel) (United Nations University Press, 2007), 314pp.

2. Making States Work: State Failure and the Crisis of Governance (with Michael Ignatieff and Ramesh Thakur) (United Nations University Press, 2005), 400pp.

1. Civilians in War (Lynne Rienner, 2001), 291pp.