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: 1962-65 Chevy Nova Hardtop Classic Outline Design Tshirt XL red
Product feature: ASIN: B00VPTDKSO, Date first listed on Amazon: March 23, 2016, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product brand: BlackOps Design
Target attributes: Shoulder Style
Answer: attribute: shoulder style
value: None
source: None