APA (7th ed.) Citation

ScienceDirect (Online service), Schudt, C., Dent, G., & Rabe, K. F. (1996). Phosphodiesterase inhibitors. Academic Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), Christian Schudt, Gordon Dent, and Klaus F. Rabe. Phosphodiesterase Inhibitors. San Diego: Academic Press, 1996.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. Phosphodiesterase Inhibitors. Academic Press, 1996.