 | | (LIR). Chant choral ed opera rumantscha. En: La Quotidiana (Seria «Lexicon Istoric Retic») 12-8-2015, p. 8.
| | Download pdf | | |  | | Collenberg, Adolf. Opera rumantscha. En: Lexicon istoric retic (tem.). Versiun da stampa 2008.
| | Link | | | | | Collenberg, Adolf. Chant choral rumantsch. En: Lexicon istoric retic (tem.). Versiun da stampa 2008.
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