Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Twelve Shelf Double Bookcase 84"H Cherry Finish
Product description: Eco-friendly cherry wood finish gives a warm, inviting look to this functional and incredibly stylish twelve-shelf double-wide bookcase.
Product feature: 84" high x 48" wide x 10 3/4" deep., Versatile double-wide bookcase with 12 shelves., Cherry finish., Constructed of wood veneer, solid wood and particle board., 10 adjustable shelves and 2 fixed bottom shelves.
Product brand: Concepts In Wood
Target attributes: Shelf Material
Answer: attribute: shelf material
value: wood
source: product description
attribute: shelf material
value: wood
source: product brand
attribute: shelf material
value: wood
source: product feature