Biostratigraphy and paleoenvironment of the Sarmatian Northern marginal zone of Poland / Iwona CZEPIEC // Biuletyn Państwowego Instytutu Geologicznego = Geological Bulletin of the Polish Geological Institute ; ISSN 0867-6143. Hydrogeologia ; ISSN 1644-0870. — Tytuł poprz.: Biuletyn Instytutu Geologicznego. — 1999 nr 387, s. 96–98. — Bibliogr. s. 98. — Carpathian foredeep basin – its evolution and mineral resources : international conference : Kraków, 17–18. 09. 1999 : abstracts. Pt. 2. — Warszawa : Państwowy Instytut Geologiczny, 1999

Biostratigraphy of quaternary lacustrine deposits in Chojna (NW Poland) / Iwona CZEPIEC // Folia Malacologica ; ISSN 1506-7629. — 1999 vol. 7 no. 4, s. 263. — 15th Polish Malacological Seminar, Łódź 1999. — tekst: https://www.foliamalacologica.com/pdf-125256-53176?filename=The%2015th%20Polish.pdf

The malacofauna of the quaternary lacustrine deposits of NW Poland / Iwona CZEPIEC // W: Second Romanian Symposium on Paleontology : 1–3 October, 1999 Cluj–Napoca, Romania : abstracts and field trip guide / Babes-Bolyai University Cluj-Napoca ; Romanian Society of Paleontologists. — [Romania : s. n.], [1999]. — S. 58–59