"I-X". Interlinguistics: Aspects of the Science of Planned Languages, edited by Klaus Schubert, Berlin, New York: De Gruyter Mouton, 1989, pp. I-X. https://doi.org/10.1515/9783110886115.fm
(1989). I-X. In K. Schubert (Ed.), Interlinguistics: Aspects of the Science of Planned Languages (pp. I-X). Berlin, New York: De Gruyter Mouton. https://doi.org/10.1515/9783110886115.fm
1989. I-X. In: Schubert, K. ed. Interlinguistics: Aspects of the Science of Planned Languages. Berlin, New York: De Gruyter Mouton, pp. I-X. https://doi.org/10.1515/9783110886115.fm
"I-X" In Interlinguistics: Aspects of the Science of Planned Languages edited by Klaus Schubert, I-X. Berlin, New York: De Gruyter Mouton, 1989. https://doi.org/10.1515/9783110886115.fm
I-X. In: Schubert K (ed.) Interlinguistics: Aspects of the Science of Planned Languages. Berlin, New York: De Gruyter Mouton; 1989. p.I-X. https://doi.org/10.1515/9783110886115.fm