APA

Wallace I. J., Worthington S., Felson D. T., Jurmain R. D., Wren K. T., Maijanen H., Woods R. J. & Lieberman D. E. (20180530). Knee osteoarthritis has doubled in prevalence since the mid-20th century. : Proceedings of the National Academy of Sciences of the United States of America.

Chicago

Wallace Ian J, Worthington Steven, Felson David T, Jurmain Robert D, Wren Kimberly T, Maijanen Heli, Woods Robert J and Lieberman Daniel E. 20180530. Knee osteoarthritis has doubled in prevalence since the mid-20th century. : Proceedings of the National Academy of Sciences of the United States of America.

Harvard

Wallace I. J., Worthington S., Felson D. T., Jurmain R. D., Wren K. T., Maijanen H., Woods R. J. and Lieberman D. E. (20180530). Knee osteoarthritis has doubled in prevalence since the mid-20th century. : Proceedings of the National Academy of Sciences of the United States of America.

MLA

Wallace Ian J, Worthington Steven, Felson David T, Jurmain Robert D, Wren Kimberly T, Maijanen Heli, Woods Robert J and Lieberman Daniel E. Knee osteoarthritis has doubled in prevalence since the mid-20th century. : Proceedings of the National Academy of Sciences of the United States of America. 20180530.