| BSI root thesaurus part 1 | British Standards Inst. | Tiada | 1981 | 0-905877-57-8 |
| BSI root thesaurus part 2 | British Standards Inst. | Tiada | 1981 | 0-905877-57-8 |
| Austronesian root theory an essay on the limits of morphology | John Benjamins Publishing | Tiada | 1988 | |
| Austronesian root theory | John Benjamins Publishing | Tiada | 1988 | |
| The origin Social root of the Malay left : an analysis of the Social Roots | | Tiada | 1975 | |
| On the fourfold root of the principle of sufficient reason | | Tiada | 1974 | |
| The origin Social root of the Malay left : an analysis of the Kesatuan Melayu Muda | Strategic Information Research Development | Tiada | 2008 | 9789833782444 |