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APA ZitierstilValk, H. 1. (2022). The newly discovered second hill fort at Sinialliku near Viljandi. Tallinn: Muinsuskaitseamet.
Chicago ZitierstilValk, Heiki 1959-. The Newly Discovered Second Hill Fort At Sinialliku Near Viljandi. Tallinn: Muinsuskaitseamet, 2022.
MLA ZitierstilValk, Heiki 1959-. The Newly Discovered Second Hill Fort At Sinialliku Near Viljandi. Tallinn: Muinsuskaitseamet, 2022.