Cita APA (7th ed.)

Krishnan, P. (1992). The elderly population in developed... world. B.R. Pub.

Cita Chicago (17th ed.)

Krishnan, P. The Elderly Population in Developed... World. Delhi: B.R. Pub, 1992.

Cita MLA (9th ed.)

Krishnan, P. The Elderly Population in Developed... World. B.R. Pub, 1992.