Charmas, M. (1991). Polar session - Arctic environment research, Lublin, Poland - April 1991. UMCS.
Citazione stile Chigago Style (17a edizione)Charmas, Maria. Polar Session - Arctic Environment Research, Lublin, Poland - April 1991. Lublin: UMCS, 1991.
Citatione MLA (9a ed.)Charmas, Maria. Polar Session - Arctic Environment Research, Lublin, Poland - April 1991. UMCS, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.