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: J.TOMSON Mens Crewneck California Republic T-Shirt WHITE SMALL
Product feature: Shipping Weight: 5.6 ounces, ASIN: B00JU7PI6U, Item model number: 8806186506976, Date first listed on Amazon: July 25, 2016, Average Customer Review: 1.0 out of 5 stars 1 customer review
Product brand: J.TOMSON
Target attributes: Neckline
Answer: attribute: neckline
value: crewneck
source: product title