María Luisa Rivero & Milena M. Sheppard. "On Impersonal se / się in Slavic"(PDF). Current Issues in Formal Slavic Linguistics. G. Zybatow, et al., Eds. 137-147. Peter Lang, Frankfurt am Main. 2002. Archived from the original(PDF) on 2007-02-05.
María Luisa Rivero & Milena M. Sheppard. "On Impersonal se / się in Slavic"(PDF). Current Issues in Formal Slavic Linguistics. G. Zybatow, et al., Eds. 137-147. Peter Lang, Frankfurt am Main. 2002. Archived from the original(PDF) on 2007-02-05.