APA citiranje

Valderas, J. M., Starfield, B., Sibbald, B., Salisbury, C., & Roland, M. (2009). Defining Comorbidity: Implications for Understanding Health and Health Services. American Academy of Family Physicians.

Citação norma Chicago

Valderas, Jose M., Barbara Starfield, Bonnie Sibbald, Chris Salisbury, and Martin Roland. Defining Comorbidity: Implications for Understanding Health and Health Services. American Academy of Family Physicians, 2009.

MLA citiranje

Valderas, Jose M., et al. Defining Comorbidity: Implications for Understanding Health and Health Services. American Academy of Family Physicians, 2009.