Çalık, A. 2021. Geology and Mineralogy of Yenisofça opal occurences, Eskişehir – NW Turkey. Uluslararası Katılımlı 73. Türkiye Jeoloji Kurultayı -73rd Geological Congress of Turkey with international participation, , (Ankara, Turkey), 252-256.

Çalık, A., (2021). Geology and Mineralogy of Yenisofça opal occurences, Eskişehir – NW Turkey . Uluslararası Katılımlı 73. Türkiye Jeoloji Kurultayı -73rd Geological Congress of Turkey with international participation, (pp.252-256). Ankara, Turkey

Çalık, AYTEN. "Geology and Mineralogy of Yenisofça opal occurences, Eskişehir – NW Turkey," Uluslararası Katılımlı 73. Türkiye Jeoloji Kurultayı -73rd Geological Congress of Turkey with international participation, , Ankara, Turkey, 2021

Çalık, AYTEN. "Geology and Mineralogy of Yenisofça opal occurences, Eskişehir – NW Turkey." Uluslararası Katılımlı 73. Türkiye Jeoloji Kurultayı -73rd Geological Congress of Turkey with international participation, , Ankara, Turkey, pp.252-256, 2021

Çalık, A. (2021) . "Geology and Mineralogy of Yenisofça opal occurences, Eskişehir – NW Turkey." Uluslararası Katılımlı 73. Türkiye Jeoloji Kurultayı -73rd Geological Congress of Turkey with international participation, , Ankara, Turkey, pp.252-256.

@conferencepaper{conferencepaper, author={AYTEN ÇALIK}, title={Geology and Mineralogy of Yenisofça opal occurences, Eskişehir – NW Turkey}, congress name={Uluslararası Katılımlı 73. Türkiye Jeoloji Kurultayı -73rd Geological Congress of Turkey with international participation, }, city={Ankara}, country={Turkey}, year={2021}, pages={252-256} }