APA Style

West, N. (2006). At her Majesty's Secret Service : the chiefs of Britain's intelligence agency, M16. . Annapolis , MD.: Naval Institute Press..

MLA Style

West, Nigel.. "At her Majesty's Secret Service : the chiefs of Britain's intelligence agency, M16.". Annapolis , MD.: Naval Institute Press., 2006. หนังสือ (Book).