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: Letters from a Father to His Daughter
Product description: About the bookletters from a father to his daughter is a collection of 30 letters written by india's first prime minister jawaharlal nehru to his daughter indira gandhi in 1928, when she was 10 years old. The letters talk about natural history and the stories of civilizations. These letters are originally written in english when nehru was in allahabad and indira in mussoorie. During the summer of 1928, nehru, busily working in allahabad, decided to write letters to his 10-year-old daughter. In the several letters he wrote, he spoke vastly of history and civilizations. He wrote her on how earth was formed, how animal and human life came into existence, how societies and civilizations formed and many more of the similar vein. He then moves on to talk about races, faiths and beliefs that exists at the present and existed in the history. He talks about the origin of languages and communication, the practice of using sounds and signs as a means of communication, how writing evolved and how different languages are related with each other. He talks about civilizations and labors, the birth of patriarchal society and the rules of kings and emperors. He then talks about trades, myths, morals, spics and different rules and rulers in india. Letters from a father to his daughter shows nehru's love for the history and civilization and his desire to teach his daughter a rich knowledge of the same. The book was published by penguin india on 4 november 2004 in hardcover.
Product brand: Jawaharlal Nehru
Target attributes: Format
Answer: attribute: format
value: hardcover
source: product description