@misc{Helias_Petrus_(ca_1100-1166?)_Grammatica, author={Helias, Petrus (ca 1100-1166?)}, howpublished={online}, publisher={Martin Flach}, language={lat}, type={inkunabuł}, title={Grammatica cum commento Ioannis Sommerfeld}, keywords={inkunabuły 15 w.}, }