Bouska, W., & Pešek, J. (1999). Distribution of elements in the world lignite average and its comparison with lignite seams of the North Bohemian and Sokolov Basins. Západočeské Muzeum.
Chicago-Zitierstil (17. Ausg.)Bouska, Wolfgang, und Jiří Pešek. Distribution of Elements in the World Lignite Average and Its Comparison with Lignite Seams of the North Bohemian and Sokolov Basins. Plzeň: Západočeské Muzeum, 1999.
MLA-Zitierstil (9. Ausg.)Bouska, Wolfgang, und Jiří Pešek. Distribution of Elements in the World Lignite Average and Its Comparison with Lignite Seams of the North Bohemian and Sokolov Basins. Západočeské Muzeum, 1999.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.