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: Mokkers Womens/Ladies Emily Moccasin Slippers
Product description: Moccasin Slipper. Real Wool Lining. Polybagged. TPR Outdoor Sole. Thermal Lining. Upper: Leather. Lining: Textile. Sole: Other.
Product feature: Mixed, ,, Moccasin Slipper., Real Wool Lining., Polybagged., TPR Outdoor Sole., Thermal Lining., Shipping Information: View shipping rates and policies, ASIN: B01GWHLR92, Date first listed on Amazon: December 23, 2018, Average Customer Review: 5.0 out of 5 stars 1 customer review
Product price: $20.45
Product brand: Mokkers
Target attributes: Type
Answer: attribute: type
value: slipper
source: product description
attribute: type
value: slipper
source: product feature
attribute: type
value: moccasin slippers
source: product title
attribute: type
value: moccasin slipper
source: product description
attribute: type
value: moccasin slipper
source: product feature