@Misc{BVMC:276304,
author = {Weitenauer, Ignaz (S.I.)},
title = {De difficillimo genere epistolarum, sive Ratio officiosas epistolas facile, pure, et eleganter scribendi},
url = {http://www.cervantesvirtual.com/obra/de-difficillimo-genere-epistolarum-sive-ratio-officiosas-epistolas-facile-pure-et-eleganter-scribendi}
}