APA Style

Health, Margaret L. (1993). Ptient Controlled analgesia (NULL). NULL: Oxford University.

Chicago Style

Health, Margaret L. Ptient Controlled analgesia. NULL NULL: Oxford University, 1993. Text.

MLA Style

Health, Margaret L. Ptient Controlled analgesia. NULL NULL: Oxford University, 1993. Text.

Turabian Style

Health, Margaret L. Ptient Controlled analgesia. NULL NULL: Oxford University, 1993. Print.