Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Top Knobs M1161 Nouveau III Square Bar Pull, Brushed Satin Nickel
Product description: Square Bar Pull 3 3/4" - Brushed Satin Nickel, Finish:Brushed Satin Nickel, Size:small - 4-9/16'(l) x 3/8'(w) x 7/8'(projection), Center-to-Center:3-3/4' screws included.
Product feature: Center to Center: 3.75" - Length: 4.56" - Projection: 0.88" - Width: 0.38", Pulls Category, Brushed Satin Nickel Finish, Contemporary / Modern Style
Product price: $7.38
Product brand: Top Knobs
Target attributes: Material
Answer: attribute: material
value: nickel
source: product title
attribute: material
value: nickel
source: product feature
attribute: material
value: nickel
source: product description