Lisa Anne Novelline, author of Piccadilly and the Fairy Polka, introduces her book at a booth during the BookExpo 2017 in New York, the United States, on June 2, 2017. BookExpo, North America's largest gathering of book industry professionals, was held from May 31 to June 2 this year with the participation of about 600 exhibitors from across the world. [Photo/Xinhua]