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: ASUS V500CA 15-Inch Laptop (OLD VERSION)
Product description: Silver Aluminum/Touch Screen/15.6" HD (1366*768) LED with Touch/Intel Core i7-4500U (2.7GHz)/8 GB (two slots, both slots filled with a 4 GB stick)/Intel GMA HD/1TB 5400RPM HDD/DL DVD+/-RW/CD-RW/Windows 8 (64bit)/802.11BGN/HD Camera/Bluetooth 4.0/50WHrs, 4500mAh, 3S1P, 3-cell Li-ion polymer Battery Pack with up to 5 hours life/Numeric Keypad, Chiclet Style
Product feature: Intel Core i7-3537U 2.0GHz, 8 GB SO-DIMM, 500GB 5400RPM Hard Drive, 15.6-Inch Screen, Windows 8
Product price: $151.53
Product brand: Asus
Target attributes: Processor Speed
Answer: attribute: processor speed
value: 2.7ghz
source: product description