Preheat oven to 350ºF.
Butter and flour an 8 ½ x 4 ½ inch loaf pan.
In a medium mixing bowl, combine all the dry ingredients (except walnuts, raisins or chocolate chips): flours, sugar, baking powder, baking soda, salt, cinnamon, nutmeg, and cloves.
In a separate mixing bowl, combine eggs, pumpkin, oil, and fresh mandarin juice then gradually add the dry ingredients until just moistened. Optionally, you can fold in walnuts, raisins or chocolate chips.
Evenly spread in a loaf pan. Bake 1 to 1 hour 15 minutes or until a knife inserted into the center of the bread comes out clean.
Cool in pan 10 minutes before transferring it to a wire rack. Let it cool completely (about 2 hours) before slicing it.