APA (7th ed.) Citation

Portenoy, R. K. Opioid Therapy for Chronic Nonmalignant Pain. Wiley.

Chicago Style (17th ed.) Citation

Portenoy, Russell K. Opioid Therapy for Chronic Nonmalignant Pain. Wiley.

MLA (9th ed.) Citation

Portenoy, Russell K. Opioid Therapy for Chronic Nonmalignant Pain. Wiley.

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