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: Anne Klein Women's Sleeveless Mock Neck Top,
Product description: Contemporary printed sleeveless knot collar blouse. Perfect alone or underneath blazer.
Product feature: 100% Polyester, Imported, Dry Clean Only, Printed, Mock neck, Package Dimensions: 13.1 x 8.9 x 0.4 inches, Shipping Weight: 5.6 ounces, ASIN: B01FHQKQVO, Item model number: 10614718, Date first listed on Amazon: June 20, 2016, Average Customer Review: 3.8 out of 5 stars 3 customer reviews
Target attributes: Neckline
Answer: attribute: neckline
value: mock neck
source: product title
attribute: neckline
value: mock neck
source: product feature