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: Fantasia Twin Upholstered Headboard In Green by Standard Furniture
Product description: What is included: Upholstered Headboard (1) Upholstered Footboard w/ Rails (1) Luxurious padded beds are upholstered in a smooth vinyl that comes in a choice of three colors, green, lavender and pink. Sizeable headboard allows space for decorative pillows. Green, lavender and pink finishes.
Product feature: Belongs to Fantasia Collection by Standard Furniture, Twin Bed: 43"W x 43"D x 40"H, Full Bed: 58"W x 58"D x 40"H, Upholstered in a smooth vinyl, Surfaces clean easily with a soft cloth
Product brand: Standard Furniture
Target attributes: Size
Answer: attribute: size
value: twin
source: product title
attribute: size
value: twin
source: product feature