Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Account Clerk(Passbooks) (Career Examination Series: C-2)
Product description: National Learning Corporation has been publishing the PASSBOOK series of test preparation books for 40 years. Those preparing for a civil service or vocational licensing exam can find the test preparation guide they're looking for in the Career Examination Series. Professional licensing titles may also be found in the Admission Test Series, pp. 61-63. The General Aptitude Series on page 60 provides intensive preparation to supplement your study in areas common to many examinations. Our research department is available to help you find the right book(s) you need for your exam(s). Our PASSBOOKS follow closely the format and content of the "real" examination, with hundreds of questions and answers. Each book is 8 1/2" x 11" in paperback (plastic bound) and lies flat for ease of use. Hardbound editions available as special order at additional charge; please inquire.
Product brand: Visit Amazon's Jack Rudman Page
Target attributes: Format
Answer: attribute: format
value: paperback
source: product description