Wald, N. J., Watt, H. C., George, L., Knekt, P., Helzlsouer, K. J., & Tuomilehto, J. (2000). Adding free to total prostate-specific antigen levels in trials of prostate cancer screening. Nature Publishing Group.
استشهاد بنمط شيكاغوWald, N J., H C. Watt, L. George, P. Knekt, K J. Helzlsouer, و J. Tuomilehto. Adding Free to Total Prostate-specific Antigen Levels in Trials of Prostate Cancer Screening. Nature Publishing Group, 2000.
MLA استشهادWald, N J., et al. Adding Free to Total Prostate-specific Antigen Levels in Trials of Prostate Cancer Screening. Nature Publishing Group, 2000.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.