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: Vans Mens Era Laceless Pro A-Skate Sneakers charcoal 13
Product description: The Vans Men's Era Pro Skate Shoe features the same clean and simple look of the Era, but with the twist of a durable all suede upper. Performance footbeds increase the skateability of this shoe. It's pretty much Van's way of reminding everyone who was the first and who is still the best at performance vulcanized.
Product feature: Upper Material: suede, canvas, Recommended Use: skateboarding, Lacing: standard, Sole: gum rubber, Arch Support: flat
Product brand: Vans
Target attributes: Style
Answer: attribute: style
value: vans
source: product title
attribute: style
value: vans
source: product description
attribute: style
value: vans
source: product brand