Cita APA (7a ed.)

Trussell, J. (1988). Teenage pregnancy in the United States. Family planning perspectives, 20(6), 262-272.

Cita Chicago Style (17a ed.)

Trussell, James. "Teenage Pregnancy in the United States." Family Planning Perspectives 20, no. 6 (1988): 262-272.

Cita MLA (8a ed.)

Trussell, James. "Teenage Pregnancy in the United States." Family Planning Perspectives, vol. 20, no. 6, 1988, pp. 262-272.