Cita APA (7th ed.)

Hahn, D. B., Payne, W. A., & Mauer, E. (2011). Focus on health (10th ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Hahn, Dale B., Wayne A. Payne, i Ellen Mauer. Focus on Health. 10th ed. New York: McGraw-Hill, 2011.

Cita MLA (9th ed.)

Hahn, Dale B., et al. Focus on Health. 10th ed. McGraw-Hill, 2011.