Cita APA (7a ed.)

Ryan, F. (1996). Virus X: Understanding the real threat of the new pandemic plagues. HarperCollins.

Cita Chicago Style (17a ed.)

Ryan, Frank. Virus X: Understanding the Real Threat of the New Pandemic Plagues. London: HarperCollins, 1996.

Cita MLA (9a ed.)

Ryan, Frank. Virus X: Understanding the Real Threat of the New Pandemic Plagues. HarperCollins, 1996.