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: Dance Class Beginner Ballet Flat (Toddler/Little Kid)
Product description: Slip on ballet slipper with no loose ties
Product feature: 100% Synthetic, Synthetic sole, Fixed tie, Shipping Weight: 0.96 ounces ( View shipping rates and policies ), ASIN: B016B9L62Y, Item model number: Beginner Ballet - K, Date first listed on Amazon: September 17, 2014, Average Customer Review: 3.2 out of 5 stars 21 customer reviews
Product price: $9.52 - $22.99
Product brand: Dance Class
Target attributes: Silhouette
Answer: attribute: silhouette
value: ballet
source: product feature
attribute: silhouette
value: ballet
source: product title
attribute: silhouette
value: ballet
source: product description