N.A. Hanania, G. Feldman, W. Zachgo, J.J. Shim i inni. The efficacy and safety of the novel long-acting β2 agonist vilanterol in patients with COPD: a randomized placebo-controlled trial. „Chest”. 142 (1), s. 119–127, lipiec 2012. DOI: 10.1378/chest.11-2231. PMID: 22241764.
N.A. Hanania, G. Feldman, W. Zachgo, J.J. Shim i inni. The efficacy and safety of the novel long-acting β2 agonist vilanterol in patients with COPD: a randomized placebo-controlled trial. „Chest”. 142 (1), s. 119–127, lipiec 2012. DOI: 10.1378/chest.11-2231. PMID: 22241764.