Akil, H., Herz, A., & Simon, E. J. (1993). Opioids. Springer-Verlag.
Lua i Stíl Chicago (17ú heag.)Akil, Huda, Albert Herz, agus Eric J. Simon. Opioids. Berlin: Springer-Verlag, 1993.
Lua MLA (9ú heag.)Akil, Huda, et al. Opioids. Springer-Verlag, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.