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| 1. |
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Rath & Strong's Six Sigma Leadership Handbook
Rath & Strong, Thomas Bertels
Inbunden. John Wiley & Sons Inc, Storbritannien, 2003.
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| 2. |
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Grundlagen der Elektrotechnik
Thomas Bertel, Thomas Kuberczyk
Häftad. Grin Verlag, Tyskland, 2015.
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| 3. |
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Internationales Kulturmanagement
Thomas Heinze, Lothar Bertels
Häftad. Springer VS, Tyskland, 2015.
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| 4. |
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Internationales Kulturmanagement
Thomas Heinze, Lothar Bertels
E-bok. Springer Fachmedien Wiesbaden, Tyskland, 2015.
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| 5. |
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Mary at the Farm and Book of Recipes Compiled during Her Visit among the 'Pennsylvania Germans'
Edith May Bertels Thomas
Häftad. E-Artnow, Tjeckien, 2024.
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| 6. |
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Mary at the Farm and Book of Recipes Compiled During Her Visit Among the Pennsylvania Germans
Edith May Bertels Thomas
Häftad. Alpha Edition, Indien, 2023.
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