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: Not to Be Taken
Product description: Born in 1893, Anthony Berkeley (Anthony Berkeley Cox) was a British crime writer and a leading member of the genre's Golden Age. Educated at Sherborne School and University College London, Berkeley served in the British army during WWI before becoming a journalist. His first novel, The Layton Court Murders, was published anonymously in 1925. It introduced Roger Sheringham, the amateur detective who features in many of the author's novels including the classic Poisoned Chocolates Case. In 1930, Berkeley founded the legendary Detection Club in London along with Agatha Christie, Freeman Wills Crofts and other established mystery writers. It was in 1938, under the pseudonym Francis Iles (which Berkeley also used for novels) that he took up work as a book reviewer for John O'London's Weekly and The Daily Telegraph. He later wrote for The Sunday Times in the mid 1940s, and then for The Guardian from the mid 1950s until 1970. A key figure in the development of crime fiction, he died in 1971.
Product brand: Visit Amazon's Anthony Berkeley Page
Target attributes: Type
Answer: attribute: type
value: fiction
source: product description