Cita APA

Hughes, D. A., & Norton, R. (2009). Vitamin D and respiratory health.

Citación estilo Chicago

Hughes, David A., and Rosemary Norton. Vitamin D and Respiratory Health. 2009.

Cita MLA

Hughes, David A., and Rosemary Norton. Vitamin D and Respiratory Health. 2009.

Warning: These citations may not always be 100% accurate.