is this an authentic panettone recipe?!

Si

Ingredients:
1 tablespoon (1 package) active dry yeast
1/4 cup warm water (110 to 115 degrees)
5 tablespoons butter, softened
2 large eggs
4 large egg yolks
3/4 cup sugar
1 tablespoon vanilla extract
1/2 cup warm water
4 1/2 to 5 cups flour, or more
2/3 cup raisins
1 tablespoon finely grated orange peel
2 teaspoons finely grated lemon peel
1/2 cup chopped citron
Preparation:
Dissolve the yeast in the 1/4 cup warm water in a small bowl. Let yeast stand for 10 minutes.
In a large bowl, beat the butter, 2 whole eggs and 4 egg yolks, sugar, vanilla and 1/2 cup water together. Add yeast mixture to the egg mixture and mix well with wooden spoon.

Working with spoon then hands, add the flour about 1 to 1 1/2 cups at a time and mix until a ball of dough is formed, adding as much flour as necessary to make an easy to handle dough. Turn the dough out onto a floured work surface and knead for 5 to 10 minutes, until the dough is smooth and elastic, adding more flour as needed. Place the dough in a lightly buttered bowl; turn to coat completely with butter. Cover with a clean cloth and let rise 6 hours.

Butter and flour a panettone mold or other high-sided mold, at least 6 1/2 to 7 inches tall and 7 to 8 inches wide.

Punch the dough down and turn it out on a floured surface. Flatten dough out with hand; sprinkle with the lemon and orange zest. In a small bowl, mix the raisins and the citron with the 1 tablespoon flour; sprinkle fruit mixture over the dough. Fold the dough in half, press edges to seal. Knead for 5 to 10 minutes, or until the pieces of dried fruit are well distributed throughout and dough is smooth. While working with the dough continue to add additional flour as necessary to keep from sticking, without making too stiff. Place dough in the mold, cover with a clean cloth and let rise 30 minutes.

Preheat oven to 400°.

Cut an x in the top of the dough with a very sharp knife. Bake for 5 minutes at 400° then reduce heat to 375° and bake for 10 minutes. Reduce heat to 350° then bake 30 to 35 minutes longer, or until a toothpick, skewer, or cake tester inserted into the center of the bread comes out clean. If the top starts to look to brown, cover loosely with foil. Let cool about 30 minutes on a wire rack; remove from rack and cool completely.

yes it seems OK, the only thing is the vanilla, most Italian recipes don't call for it, but here's one ( in Italian) where you can check the ingredients.
http://www.kucinare.it/ricetta/Panettone…