et al. UK ISBN 0747532699 /U.S. ISBN 0590353403 . Rowling, J. K. (1998). Harry Potter and the Chamber of Secrets . London: Bloomsbury /New York City: Scholastic , et al. UK ISBN 0747538492 /U.S. ISBN 0439064864 . Rowling, J. K. ( Kennilworthy Whisp ; 2001). Quidditch Through the Ages (in English). London: Bloomsbury