APA (7th ed.) Citation

Levine, R. L. Respiratory rate: The third vital sign. Elsevier.

Chicago Style (17th ed.) Citation

Levine, Robert L. Respiratory Rate: The Third Vital Sign. Elsevier.

MLA (9th ed.) Citation

Levine, Robert L. Respiratory Rate: The Third Vital Sign. Elsevier.

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