A woman clears up books on the BookExpo America (BEA) in New York, the United States, May 29, 2013. BEA, the leading event in North American publishing, unveiled its curtain on Wednesday. (Xinhua/Wang Lei)

A woman carries books in her arms during the BookExpo America (BEA) in New York, the United States, May 29, 2013. BEA, the leading event in North American publishing, unveiled its curtain on Wednesday. (Xinhua/Wang Lei)

People read books during the BookExpo America (BEA) in New York, the United States, May 29, 2013. BEA, the leading event in North American publishing, unveiled its curtain on Wednesday. (Xinhua/Wang Lei)

A woman read a book during the BookExpo America (BEA) in New York, the United States, May 29, 2013. BEA, the leading event in North American publishing, unveiled its curtain on Wednesday. (Xinhua/Wang Lei)

People select books on the BookExpo America (BEA) in New York, the United States, May 29, 2013. BEA, the leading event in North American publishing, unveiled its curtain on Wednesday. (Xinhua/Wang Lei)

People are seen on the BookExpo America (BEA) in New York, the United States, May 29, 2013. BEA, the leading event in North American publishing, unveiled its curtain on Wednesday. (Xinhua/Wang Lei)

People take part in the BookExpo America (BEA) in New York, the United States, May 29, 2013. BEA, the leading event in North American publishing, unveiled its curtain on Wednesday. (Xinhua/Wang Lei)

A man selects books on the BookExpo America (BEA) in New York, the United States, May 29, 2013. BEA, the leading event in North American publishing, unveiled its curtain on Wednesday. (Xinhua/Wang Lei)

People take part in the BookExpo America (BEA) in New York, the United States, May 29, 2013. BEA, the leading event in North American publishing, unveiled its curtain on Wednesday. (Xinhua/Wang Lei)

A young man is seen on the BookExpo America (BEA) in New York, the United States, May 29, 2013. BEA, the leading event in North American publishing, unveiled its curtain on Wednesday. (Xinhua/Wang Lei)