Burkes, R. M., Couper, D. J., Barjaktarevic, I. Z., Cooper, C. B., Labaki, W. W., Han, M. K., . . . Drummond, M. B. (2021). Age-Dependent Associations Between 25-Hydroxy Vitamin D Levels and COPD Symptoms: Analysis of SPIROMICS. Chronic Obstr Pulm Dis.
استشهاد بنمط شيكاغوBurkes, Robert M., et al. "Age-Dependent Associations Between 25-Hydroxy Vitamin D Levels and COPD Symptoms: Analysis of SPIROMICS." Chronic Obstr Pulm Dis 2021.
MLA استشهادBurkes, Robert M., et al. "Age-Dependent Associations Between 25-Hydroxy Vitamin D Levels and COPD Symptoms: Analysis of SPIROMICS." Chronic Obstr Pulm Dis 2021.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.