Hewson, J., & Bubeník, V. (1997). Tense and aspect in Indo-European languages: Theory, typology, diachrony. J. Benjamins.
Lua i Stíl Chicago (17ú heag.)Hewson, John, agus Vít Bubeník. Tense and Aspect in Indo-European Languages: Theory, Typology, Diachrony. Amsterdam ; Philadelphia: J. Benjamins, 1997.
Lua MLA (9ú heag.)Hewson, John, agus Vít Bubeník. Tense and Aspect in Indo-European Languages: Theory, Typology, Diachrony. J. Benjamins, 1997.
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