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: Prima Marketing WPSET-76738 Earth Tones Mixed Media Watercolor Pencils (12 Pack)
Product description: Prima Marketing-Mixed Media Watercolor Pencils. Use them with a wet brush or dip the pencil in water and draw! This package contains twelve watercolor pencils within one 7-1/2x4-1/2x1/2 inch tin case. Comes in a variety of assorted colors. Each sold separately. Imported.
Product feature: Prima Mixed Media Watercolor Pencils 12/Pkg, Use them with a wet brush or dip the pencil in water and draw, Each sold separately
Product price: $13.74
Product brand: Prima Marketing
Target attributes: Quantity
Answer: attribute: quantity
value: 12 pack
source: product title
attribute: quantity
value: 12/pkg
source: product feature