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: Mt. Emey Men's 9505
Product description: Extra soft genuine Nappa leather uppers. Removable multi-density, dual-ply, leather cover cushion insert. High density unit EVA flex outsole. Plastazote insert set sold separately.
Product feature: leather, Shipping Information: View shipping rates and policies, ASIN: B07CR8TYF3, Date first listed on Amazon: September 9, 2014, Average Customer Review: 4.1 out of 5 stars 3 customer reviews
Product brand: Mt. Emey
Target attributes: Boot Style
Answer: attribute: boot style
value: None
source: None