APA (7th ed.) Citation

ScienceDirect (Online service), Gehrke, C. W., & Kuo, K. C. T. (1990). Chromatography and modification of nucleosides. Elsevier.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), Charles W. Gehrke, and Kenneth C. T. Kuo. Chromatography and Modification of Nucleosides. Amsterdam ; New York: Elsevier, 1990.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. Chromatography and Modification of Nucleosides. Elsevier, 1990.