I think the OP may be asking about where in Greece to find spell books written in Latin.
Based on a couple bits in the two short posts, I might guess English is not Nelli's first language.
That said, I think the answer would first lie within books of spells written in Latin.
Therein lies part of a longer path:
Some of the connection between Latin and magic dates to Medieval times.
I have been occasionally reading a book about exactly this.
Through a lot of associations some time around the 1500s, limited literacy among the lower classes whose folk traditions were being repressed by mandated Catholicism, and the mixing of ideas, the idea that Latin is somehow associated with things Spiritual in nature was born, and has remained connected.
To this day, fictional magic is still often written with a Latin sound. The Harry Potter books are an excellent example.
In reality, Latin has little to actually do with magic, and much of the Western traditions were not originated nor practiced in Latin.
Nelli, is there some specific reason you want books in Latin? I am sure there are many excellent resources which have been translated into your own native language.
It has to do with my past life. I was a witch and I remember that I was working with latin spells and I want to continue because I thing they can be more powerful I also don't think that spells in English or Ancient Greek work so well.
I never considered that perhaps my interest in the Latin Language had something to do with me being a witch. Interesting. I might want to do my spells in Latin also because Latitia Latinae Aeterna Est. (The Latin Language is Forever!)