MLA

Freye, Enno, Joseph Victor Levy, and Joseph V Levy. Opioids In Medicine. Springer Netherlands, 2008.

APA

Freye, E., Levy, J. Victor, & Levy, J. V. (2008). Opioids in Medicine. Springer Netherlands.

Chicago

Freye, Enno, Joseph Victor Levy, and Joseph V Levy. Opioids In Medicine. : Springer Netherlands, 2008.