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Internet
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| Gross, Manfred. Grass, Chasper Ans. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Weibel, Andrea. Grass, Hans. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Collenberg, Adolf. Grass, Hans. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Bundi, Martin. Grass, Johann (jun.). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Bundi, Martin. Grass, Johann (sen.). En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Bundi, Martin. Grass, Johann Anton. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Simonett, Jürg. Grass, Josias. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Bundi, Martin. Grass, Otto. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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| Bundi, Martin. Gratarolus, Gulielmus. En: Lexicon istoric retic (bio.). Versiun da stampa 2008. |
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