Cita APA (7a ed.)

Biddle, S., & Armstrong, N. (1992). Children's physical activity: An exploratory study of psychological correlates. [s.n.].

Cita Chicago Style (17a ed.)

Biddle, Stuart, y Neil Armstrong. Children's Physical Activity: An Exploratory Study of Psychological Correlates. [S.l.]: [s.n.], 1992.

Cita MLA (9a ed.)

Biddle, Stuart, y Neil Armstrong. Children's Physical Activity: An Exploratory Study of Psychological Correlates. [s.n.], 1992.