@misc{Roomen_Adriaan_van_(1561-1615)_Specvlvm,
 author={Roomen, Adriaan van (1561-1615)},
 howpublished={online},
 publisher={Joannes Masius},
 publisher={Levinus Hulsius},
 language={lat},
 title={Specvlvm Astronomicvm, Sive Organvm Forma Mappæ Expressvm : In qvo licet immobili Omnes qvi in Primo cælo, Primoqve mobili spectari solent motus, per Canones ea de re conscriptos, planissime sine ullius regulæ aut volvelli beneficio repræsentantur},
 type={starodruk},
}