Musculoskeletal system: anatomy, physiology, and metabolic disorders. Summit, NewJersey: Ciba-Geigy Corporation ISBN 0-914168-88-6, p. 130: One exception is the
Sheffrin SM (2003). Economics: Principles in Action. Upper Saddle River, NewJersey: Pearson Prentice Hall. p. 471. ISBN 978-0-13-063085-8. "Composition of