Cita APA (7a ed.)

Blair, S. N. (1992). How much physical activity is good for health? [s.n.].

Cita Chicago Style (17a ed.)

Blair, S. N. How Much Physical Activity Is Good for Health? [S.l.]: [s.n.], 1992.

Cita MLA (9a ed.)

Blair, S. N. How Much Physical Activity Is Good for Health? [s.n.], 1992.