Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Vince Comuto Leisha Black Venice Leather Boots
Product feature: Synthetic sole, Product Dimensions: 13.7 x 0.6 x 8.8 inches, Shipping Weight: 3.4 pounds, ASIN: B00PSSK2W0, Date first listed on Amazon: February 19, 2015, Average Customer Review: 3.3 out of 5 stars 2 customer reviews
Target attributes: Heel Style
Answer: attribute: heel style
value: None
source: None