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: Instruction Book for Beginning Organists
Product description: This book is designed for beginning church organists. The emphasis throughout the book is practical, although some chapters deal with basic theoretical concepts. There is an array of music & music examples included. Chapters ? introduction to the instrument ? The pedals ? The manuals - legato ? Practice habits ? The pedals: heel & toe ? Phrasing ? Pedal phrasing & additional aspects of pedal technique ? Coordination ? Trios ? Alternate toes ? Repeated notes ? The manuals: repeated notes & voice leading ? Three special problems in voice leading ? Coordination: repeated notes ? The hymn ? The hymn: Free harmonizations ? Stops & registration ? Ornamentation ? Legato & staccato styles ? The organist to church work: service playing ? Playing on two manuals with one hand ? Improvisation for the beginner ? Left hand carrying three legato voices ? On teaching
Product brand: David Johnson
Target attributes: Reference Type
Answer: attribute: reference type
value: None
source: None