APA

Martin S., . (2008). 15 minute better back workout. London: Dorling Kindersley.

Chicago

Martin Suzanne, . 2008. 15 minute better back workout. London: Dorling Kindersley.

Harvard

Martin S., . (2008). 15 minute better back workout. London: Dorling Kindersley.

MLA

Martin Suzanne, . 15 minute better back workout. London: Dorling Kindersley. 2008.