APA (7th ed.) Citation

Johnston, S., Pippen, J., Pivot, X., Lichinitser, M., Sadeghi, S., Dieras, V., . . . Pegram, M. (2009). Lapatinib combined with letrozole versus letrozole and placebo as first-line therapy for postmenopausal hormone receptor-positive metastatic breast cancer. Journal of clinical oncology, 27(33), 5538. https://doi.org/10.1200/JCO.2009.23.3734

Chicago Style (17th ed.) Citation

Johnston, Stephen, et al. "Lapatinib Combined with Letrozole Versus Letrozole and Placebo as First-line Therapy for Postmenopausal Hormone Receptor-positive Metastatic Breast Cancer." Journal of Clinical Oncology 27, no. 33 (2009): 5538. https://doi.org/10.1200/JCO.2009.23.3734.

MLA (9th ed.) Citation

Johnston, Stephen, et al. "Lapatinib Combined with Letrozole Versus Letrozole and Placebo as First-line Therapy for Postmenopausal Hormone Receptor-positive Metastatic Breast Cancer." Journal of Clinical Oncology, vol. 27, no. 33, 2009, p. 5538, https://doi.org/10.1200/JCO.2009.23.3734.