@book{ 0-272459569, title = {Sonnentage - Mondjahre: über Kalendersysteme und Zeitrechnung}, series = {Akzent}, author = {Hahn, István and Singer, Jindra and Arndt, Johann}, editor = {Singer, Jindra}, editor = {Arndt, Johann}, editor = {Hahn, István}, editor = {Hahn, István}, address = {Leipzig}, publisher = {Urania-Verlag}, year = {1989}, edition = {1. Aufl.}, isbn = {3332002678}, language = {German}, language = {Hungarian}, url = {https://katalog.skd.museum/Record/0-272459569} }