Weigh or lightly spoon flours into dry measuring cups; level with a knife. Combine flours, cinnamon, and next 5 ingredients (through salt) in a medium bowl, stirring with a whisk. Make a well in center of mixture. Combine sugar and next 3 ingredients (through eggs), stirring with a whisk. Stir in canned pumpkin; add to flour mixture, stirring just until moist. Spoon batter into 2 (9 x 5inch) or 4 (5 x 3inch) loaf pans coated with cooking spray.
Bake large loaves at 350° for 1 hour; bake small loaves at 350° for 25 minutes. Loaves are done when a wooden pick inserted in center comes out clean. Cut each large loaf into 12 slices; each small loaf into 6 slices.