APA (7th ed.) Citation

ScienceDirect (Online service), Siebert, W., & Bagnall, K. W. (1975). The chemistry of sulphur. Pergamon Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), W. Siebert, and K. W. Bagnall. The Chemistry of Sulphur. Oxford, England ; New York: Pergamon Press, 1975.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. The Chemistry of Sulphur. Pergamon Press, 1975.