APA (7th ed.) Citation

Ngan Kee, W. D., Khaw, K. S., & Wong, E. L. Y. (1999). Randomised double-blind comparison of morphine vs. a morphine–alfentanil combination for patient-controlled analgesia. Blackwell Science Ltd.

Chicago Style (17th ed.) Citation

Ngan Kee, W. D., K. S. Khaw, and E. L. Y. Wong. Randomised Double-blind Comparison of Morphine Vs. a Morphine–alfentanil Combination for Patient-controlled Analgesia. Oxford: Blackwell Science Ltd, 1999.

MLA (9th ed.) Citation

Ngan Kee, W. D., et al. Randomised Double-blind Comparison of Morphine Vs. a Morphine–alfentanil Combination for Patient-controlled Analgesia. Blackwell Science Ltd, 1999.