Cambridge University Press · Hawthorn Press
| title | ISBN-13 (ISBN-10) | year of publica- tion |
|---|---|---|
| Perspectives on language contact: based on a study of German in Australia, | 978-0-7256-0076-1 (0-7256-0076-4) | 1972 |
| The German Language in a Changing Europe | 978-0-521-49970-5 (0-521-49970-4) | 1995 |