APA (7th ed.) Citation

Kremenchutzky, M., Rice, G., Baskerville, J., Wingerchuk, D., & Ebers, G. (2006). The natural history of multiple sclerosis: A geographically based study 9: observations on the progressive phase of the disease.

Chicago Style (17th ed.) Citation

Kremenchutzky, M., G. Rice, J. Baskerville, D. Wingerchuk, and G. Ebers. The Natural History of Multiple Sclerosis: A Geographically Based Study 9: Observations on the Progressive Phase of the Disease. 2006.

MLA (9th ed.) Citation

Kremenchutzky, M., et al. The Natural History of Multiple Sclerosis: A Geographically Based Study 9: Observations on the Progressive Phase of the Disease. 2006.