APA (7th ed.) Citation

S, S., M, Y., JD, P., & EM, E. (2009). Cladribine: Not just another purine analogue? Expert opinion on investigational drugs, 18(8), 1169. https://doi.org/10.1517/13543780903071038

Chicago Style (17th ed.) Citation

S, Spurgeon, Yu M, Phillips JD, and Epner EM. "Cladribine: Not Just Another Purine Analogue?" Expert Opinion on Investigational Drugs 18, no. 8 (2009): 1169. https://doi.org/10.1517/13543780903071038.

MLA (9th ed.) Citation

S, Spurgeon, et al. "Cladribine: Not Just Another Purine Analogue?" Expert Opinion on Investigational Drugs, vol. 18, no. 8, 2009, p. 1169, https://doi.org/10.1517/13543780903071038.