@misc{
title = {Piano sonatas op. 109, op. 110, op. 111},
author = {Beethoven, Ludwig : van},
editor = {Gulda, Friedrich},
editor = {998035220808896 - Ludwig van Beethoven - 53 -  },
editor = {Registrazione: Austria, 1967 },
year = {2008},
address = {Olanda},
publisher = {Brilliant classics},
}