Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Apparel Sense A.S Juniors Cotton Solid/Plaid Roll Up Sleeve Button Down Shirts w/Pockets
Product description: Skinny Fitted Basic Button Down 1/2 Sleeve Combined Side Rib Shirt
Product feature: 100% Cotton, Juniors Slim Fit Basic Cotton Roll Up Sleeve Ribbed side Button Down Shirts, Modern timeless Classic Stylish Blouse-Perfect for work and any occasion., Model Size: Model is wearing a US Small size., Imported, Hand or Machine Cold,Hang or Line Dry, JUNIORS Size :Please order Two size BIGGGER for comfort.(RUNS SMALL), Shipping Information: View shipping rates and policies, ASIN: B00JJVTECG, Date first listed on Amazon: April 8, 2014, Average Customer Review: 3.4 out of 5 stars 61 customer reviews
Product brand: Apparel Sense
Target attributes: Neckline
Answer: attribute: neckline
value: button down
source: product feature
attribute: neckline
value: button down
source: product title
attribute: neckline
value: button down
source: product description