Zdrojom
Zdrojom is the instrumental singular form of the Slovak noun zdroj, meaning "source" or "origin." It is used to refer to the place, thing, or person from which something comes, or to indicate the means by which something is produced or obtained.
Meanings and usage: The word zdroj covers physical sources (for example, zdroj vody, zdroj energie) as well
Grammatical notes: Slovak uses the instrumental case for certain syntactic patterns; zdrojom is the form used
Etymology and cognates: The word comes from a Proto-Slavic root and has cognates in other Slavic languages,