Keynote 4 is a language course book published by Cengage Heinle in 2016. It is a part of the Keynote (American English) series and is authored by Helen Stephenson, Lewis Lansford, and Paul Dummett. The book is a trade paperback with a length of 10.9in, height of 0.4in, and width of 8.5in. It weighs 19.2 Oz and features a new edition.