| title | media type | ISBN-13 | year of publication |
|---|---|---|---|
| International Law and Boundary Disputes in Africa | Paperback | 978-1-138-71309-3 | 2016 |
| International Law and Boundary Disputes in Africa | Hardcover | 978-0-415-83892-4 | 2015 |
| Sovereignty and Jurisdiction in Airspace and Outer Space: Legal Criteria for Spatial Delimitation | Paperback | 978-0-367-86504-7 | 2019 |
| Sovereignty and Jurisdiction in Airspace and Outer Space: Legal Criteria for Spatial Delimitation | " | 978-0-415-81871-1 | 2011 |