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: Ali Ind. 3037 7 Stick-On Sanding Disc
Product description: For Use On Wood, Metal, Drywall, Fiberglass, And Painted Surfaces. For Use On Bench Top Belt/Disc Sanders. These Are Complete Line Of Heavy-Duty Shop Products That Will Bring You Years Of Reliable Performance.
Product feature: For Use On Bench Top Belt/Disc Sanders
Product price: $6.80
Product brand: Ali Ind.
Target attributes: Form
Answer: attribute: form
value: disc
source: product description
attribute: form
value: disc
source: product feature
attribute: form
value: disc
source: product title