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: 25 PACK - SanDisk 16GB MicroSD HC Memory Card SDSDQAB-016G (Bulk Packaging) LOT OF 25 with USB 2.0 MicoSD & SD Memory Card Reader
Product feature: SanDisk 16GB Class 4 UHS-1 MicroSD HC Memory Card, Bulk packed in case (1 case per memory card), 1 year factory warranty, Listing includes: 25x Memory Card, 25x plastic case, 1x Card Reader
Product price: $5.99
Product brand: SanDisk
Target attributes: SD Format
Answer: attribute: sd format
value: microsd hc
source: product title
attribute: sd format
value: microsd hc
source: product feature