Cita APA (7th ed.)

Hahn, D. B., & Payne, W. A. (1999). Focus on health. McGraw Hill Companies.

Cita Chicago (17th ed.)

Hahn, Dale B., i Wayne A. Payne. Focus on Health. Boston, Massachusetts: McGraw Hill Companies, 1999.

Cita MLA (9th ed.)

Hahn, Dale B., i Wayne A. Payne. Focus on Health. McGraw Hill Companies, 1999.