Cita APA (7th ed.)

Apple, M., Macgregor, R., Payne-James, J., Curtis, P., & Curtis, C. R. (1994). Symptoms and early warning signs: A comprehensive guide to more than 600 medical symptoms and what they mean. Dutton.

Cita Chicago (17th ed.)

Apple, Michael, Roy Macgregor, Jason Payne-James, Peter Curtis, i Carolyn R.N Curtis. Symptoms and Early Warning Signs: A Comprehensive Guide to More than 600 Medical Symptoms and What They Mean. New York: Dutton, 1994.

Cita MLA (9th ed.)

Apple, Michael, et al. Symptoms and Early Warning Signs: A Comprehensive Guide to More than 600 Medical Symptoms and What They Mean. Dutton, 1994.