Cita APA (7a ed.)

Apter, S. J., & Propper, C. A. (1986). Ecological perspectives on youth violence. Youth violence, 140-159.

Cita Chicago Style (17a ed.)

Apter, Steven J., y Cathy A. Propper. "Ecological Perspectives on Youth Violence." Youth Violence 1986: 140-159.

Cita MLA (9a ed.)

Apter, Steven J., y Cathy A. Propper. "Ecological Perspectives on Youth Violence." Youth Violence, 1986, pp. 140-159.