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: Original Penguin Men's Long Sleeve True Indigo Plaid Button Down Shirt
Product description: Long sleeve true indigo plaid button down woven shirt
Product feature: 100% Cotton, Imported, Machine Wash, Penguin logo, Heritage slim fit, Package Dimensions: 12.7 x 11.4 x 1.2 inches, Shipping Weight: 10.4 ounces, ASIN: B019PCASLY, Item model number: OPWS6C15, Date first listed on Amazon: February 11, 2016, Average Customer Review: 4.3 out of 5 stars 6 customer reviews
Target attributes: Neckline
Answer: attribute: neckline
value: button down
source: product title
attribute: neckline
value: button down
source: product description