Cita APA (7th ed.)

Lenburg, J. (2007). Viva- Facts On File guide to research. Viva Books Pvt. ltd..

Cita Chicago (17th ed.)

Lenburg, Jeff. Viva- Facts On File Guide to Research. New Delhi: Viva Books Pvt. ltd., 2007.

Cita MLA (8th ed.)

Lenburg, Jeff. Viva- Facts On File Guide to Research. Viva Books Pvt. ltd., 2007.