Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Chariot Trading Company Floral Printed Canvas Backpack College Girls' School Bag Flowers Women Rucksack
Product description: High Quality
Product feature: Item Type : Backpacks, Backpacks Type : Softback, Closure Type : Zipper, Main Material : Canvas, * Please Check Your Size from The Picture
Product brand: Chariot Trading Company
Target attributes: Material
Answer: attribute: material
value: canvas
source: product title
attribute: material
value: canvas
source: product feature