APA način citiranja (7. izdanje)
Swan, T., & Westvik, O. J. (1997). Modality in Germanic languages: Historical and comparative perspectives. Mouton de Gruyter.
Čikaški stil citiranja (17. izdanje)
Swan, Toril, i Olaf Jansen Westvik. Modality in Germanic Languages: Historical and Comparative Perspectives. Berlin ; New York: Mouton de Gruyter, 1997.
MLA način citiranja (9. izdanje)
Swan, Toril, i Olaf Jansen Westvik. Modality in Germanic Languages: Historical and Comparative Perspectives. Mouton de Gruyter, 1997.
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