Exercitatio Physica, De Phantasia eiusq[ue] Viribus admirandis / Quam ... In inclyta Leucorea Sub Praesidio ... Dn. M. Johannis Sperlings Laucha-Thuringi ... Publicae ventilationis caussa ad placidam ... proponit Godofredus Geritius Brega-Sil. Ad diem 19. Martii ... Wittebergae : Rothius, 1631