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: Sperry Top-Sider Men's Bahama 2-Eye Burnished,Brown Burnished,US 11.5 M
Product feature: Synthetic, Package Dimensions: 13 x 7.7 x 5 inches, Shipping Weight: 2.75 pounds, ASIN: B00ANAO8YG, Item model number: 10281790, Date first listed on Amazon: August 12, 2013, Average Customer Review: 5.0 out of 5 stars 1 customer review
Target attributes: Toe Style
Answer: attribute: toe style
value: None
source: None