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: Khan Square Retro Sunglasses Multiple Colors
Product description: XtremeUV sunglasses are created to stand out and compete with designer items in $20-$50 price range. XtremeUV offers trendy, up to date latest eyewear styles with qualities and designs surpassing similar mainstream product. Our market expertise comes as a result of years of hands-on experience in eyewear industry, dedication to constant development and improvement and maintaining family-like relationships with industry leading manufacturers. Be assured that our goal is to provide you with great value for money, making your shopping fun and pleasant. All XtremeUV sunglasses comply with UV400 standard filtering out 100% of harmful UV radiation. They offer even more eye protection than medical experts agree is needed for safety. XtremeUV sun glasses comply with US ANSI Z80.3 UV Protection Standards (European 89/686/EEC & Australian AS/NZS 1067:2003).
Product feature: plastic frame, plastic lens, non-polarized, Lens width: 55 millimeters, XtremeUV sunglasses are created to stand out and compete with designer items in $20-$50 price range., UV400 standard - 100% UV Protection, Drawstring Pouch included, All orders are shipped on the same or following business day, Sunglasses measurements: Full Width - 139 mm (5.45"), Full Height - 46 mm (1.8"), Lens Width - 55 mm (2.15"), Shipping Information: View shipping rates and policies, ASIN: B00O2PU0YK, Date first listed on Amazon: October 1, 2014, Average Customer Review: 3.0 out of 5 stars 1 customer review
Product price: $9.99
Product brand: KHAN
Target attributes: Silhouette
Answer: attribute: silhouette
value: square
source: product title