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: Unionbay Big Boys' Short Sleeve Heaton Poplin Button Up Shirt
Product feature: 100% Cotton, Imported, Machine Wash, Button up short sleeve shirt, Cut and sew detail, 1 chest pocket, Package Dimensions: 9.2 x 7 x 2.3 inches, Shipping Weight: 4 ounces, ASIN: B00I492DEA, Date first listed on Amazon: April 9, 2014, Domestic Shipping: Item can be shipped within U.S., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 4.5 out of 5 stars 2 customer reviews
Target attributes: Sleeve Style
Answer: attribute: sleeve style
value: short sleeve
source: product feature
attribute: sleeve style
value: short sleeve
source: product title