Harry Potter and the Half-blood Prince - Rowling, Joanne Kathleen, 1965- (Bloomsbury, 2005)
Titles available in the Harry Potter series ( in reading order) : Harry Potter and the Philosoper's Stone, Harry Potter and the Chamber of Secrets, Harry potter and the Prisoner of Azkaban, Harry Potter and the Goblet of Fire, Harry Potter and the Order of the Poenix, Harry Potter and the Half-Blood Prince