Mazurkiewicz-Sułkowska J. Language of employees of the Communist-era state security service in the Polish People’s Republic and the People’s Republic of Bulgaria (based on an analysis of “Bolek” and “Sabina” collaborators files). In: Buras-Marciniak A, Goźdź-Roszkowski S, eds. Specialized Languages in Intercultural Communication. Lodz University Press; 2020:119-131. doi:10.18778/8220-071-3.10