about the cited book Cook are you sure you do not want to use citebook title The Encyclopedia of the Chemical Elements pages 499 511 isbn 0278916430 author Clifford A Hampel year 1968 publisher Thomson Learning EMEA Ltd instaed of Cook Gerhard A Lauer Carol M 1968 Oxygen in Clifford A Hampel The Encyclopedia of the Chemical Elements New York Reinhold Book Corporation 499 512 LCCN 68 29938