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: MOON RIDER Skateboarding Mint Poster Artist ROBERT PROKOP (22" x 34" Tall) Dated 1988
Product description: BRAND NEW Store Stock.....Pristine Condition...MOON RIDER Skateboarding by Artist ROBERT PROKOP...LARGE 22 Inches Wide x 34 Inches Tall...Vintage 1988 Date on Poster...Deep Rich Colors From Being Stored Out Of the Light...SEALED in the Original Store Protective Plastic Sleeve...Marked on the Bottom Left: "AAG American Arts & Graphics, Inc. Seattle, WA, USA Robert Prokop Artist"...Marked on the Bottom Right: "PC0337 MOON RIDER"
Product feature: MOON RIDER Skateboarding Mint Sealed Poster, Vintage 1988 Date on Poster--From the Artist Robert Prokop, Large Poster Measures 22 Inches Wide x 34 Inches Tall, Deep Rich Colors From Being Stored Out Of the Light
Product price: $19.99
Product brand: Robert Prokop
Target attributes: Type
Answer: attribute: type
value: poster
source: product feature
attribute: type
value: poster
source: product title
attribute: type
value: poster
source: product description