Barrett, S. (2011). The total gym ball workout: Trade secrets of a personal trainer (First edition.). Bloomsbury.
Citace podle Chicago (17th ed.)Barrett, Steve. The Total Gym Ball Workout: Trade Secrets of a Personal Trainer. First edition. London: Bloomsbury, 2011.
Citace podle MLA (9th ed.)Barrett, Steve. The Total Gym Ball Workout: Trade Secrets of a Personal Trainer. First edition. Bloomsbury, 2011.
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