lähteenä
Lähteenä is the essive form of the Finnish noun lähde, meaning a source or origin. In Finnish, the essive case expresses a temporary state or role, so lähteenä is used to indicate that something functions as a source of information, data, or inspiration. It is a common construction in academic writing, journalism, and general prose when attributing or identifying the basis for a statement.
In practice, lähteenä is used to introduce or denote sources. Examples include: Lähteenä käytettiin museoarkistoon tallennettuja
Grammatical note: lähteenä connotes the role of the source in the present or in a cited passage,
Related terms include lähde (singular), lähteet (plural), and common compound expressions such as tutkimuslähde (research source)