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If were a citizen of the Kingdom of the Netherlands, with a passport issued by that country, you would need a visa.
If you are a citizen of Italy, with a passport issued by the Kingdom of the Netherlands, again, you would need a visa.
If you are an Italian citizen, with a passport issued by the government of Italy, then you are exempt, as you yourself indicate.
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Updated Post:
Italian citizens do not need a visa to visit Turkey.
For future visa questions for Italian citizens, although it isn't always accurate, check this
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Assuming you're Dutch, you need to get a visa. You do this online: