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: Kirkland Mens' Cotton, Long-sleeve Button-down Dress Shirt
Product description: This Kirkland brand shirt presents a premium quality, non-iron woven shirt with extra long staple cotton. The yarns are 2-ply for a softer hand and superior performance.
Product feature: 100% Cotton, Machine Wash Warm, Wrinkle Free; Non Iron, Treated to Resist Water and Oil Based Stains, Unbreakable Buttons; Cross Stitched for Extra Strength, Fine Single-needle Tailoring, Generous Cut for Comfort, Product Dimensions: 8 x 2 x 9 inches, Shipping Weight: 12 ounces, ASIN: B017X3CF86, Date first listed on Amazon: November 13, 2015, Average Customer Review: 5.0 out of 5 stars 2 customer reviews
Product brand: Kirkland Signature
Target attributes: Neckline
Answer: attribute: neckline
value: button-down
source: product title
attribute: neckline
value: dress shirt
source: product title