Caspar Ursinus Velius to Miklós Oláh (Stuttgart, 10 September 1531)
Caspar Ursinus Velius, levél, Epistulae. Pars I. 1523–1533, 2018
Caspar Ursinus Velius, letter, Epistulae. Pars I. 1523–1533, 2018