Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Trailmaker Little Girls' Animal Leopard Print Backpack
Product description: Front zip pocket
Product feature: Single-compartment backpack featuring animal-print front with contrasting stone-embellished pocket and solid back, Padded back and shoulder straps
Product brand: Trail maker
Target attributes: Material
Answer: attribute: material
value: None
source: None