https://www.controversia-et-confessio.de/cc-digital/personen/register/eintraege/sperling-albert.html?cHash=12e6295d29124597fff1362bfa58ce9b
Sperling, Albert : Controversia et Confessio
controversia et confessiosperlingalbert
https://dbis.uni-regensburg.de/UBOS/resources/11352
DBIS - Controversia et Confessio
controversia et confessiodbis