Preheat oven to 350°. Grease and flour two 5-3/4x3x2-in loaf pans.

In a large bowl, cream butter and sugar until light and fluffy. Add 1 egg at a time, beating well after each addition. Beat in lemon zest and extracts. In another bowl, whisk flour, salt and baking soda; add to creamed mixture alternately with sour cream, beating well after each addition.

Transfer to prepared pans. Bake 35-40 minutes or until a toothpick inserted in center comes out clean. Cool in pans 10 minutes before removing to wire racks to cool completely.