Cita APA

Collard, H. R., Anstrom, K. J., Schwarz, M. I., & Zisman, D. A. (2007). Sildenafil Improves Walk Distance in Idiopathic Pulmonary Fibrosis.

Chicago Style Citation

Collard, Harold R., Kevin J. Anstrom, Marvin I. Schwarz, i David A. Zisman. Sildenafil Improves Walk Distance in Idiopathic Pulmonary Fibrosis. 2007.

Cita MLA

Collard, Harold R., Kevin J. Anstrom, Marvin I. Schwarz, i David A. Zisman. Sildenafil Improves Walk Distance in Idiopathic Pulmonary Fibrosis. 2007.