APA

Gómez F., Davila H., Costa A., Acuña A., Wadskier L. A. & Plua P. (20030122). Efficacy and safety of oral sildenafil citrate (Viagra) in the treatment of male erectile dysfunction in Colombia, Ecuador, and Venezuela: a double-blind, multicenter, placebo-controlled study. : International journal of impotence research.

Chicago

Gómez F, Davila H, Costa A, Acuña A, Wadskier L A and Plua P. 20030122. Efficacy and safety of oral sildenafil citrate (Viagra) in the treatment of male erectile dysfunction in Colombia, Ecuador, and Venezuela: a double-blind, multicenter, placebo-controlled study. : International journal of impotence research.

Harvard

Gómez F., Davila H., Costa A., Acuña A., Wadskier L. A. and Plua P. (20030122). Efficacy and safety of oral sildenafil citrate (Viagra) in the treatment of male erectile dysfunction in Colombia, Ecuador, and Venezuela: a double-blind, multicenter, placebo-controlled study. : International journal of impotence research.

MLA

Gómez F, Davila H, Costa A, Acuña A, Wadskier L A and Plua P. Efficacy and safety of oral sildenafil citrate (Viagra) in the treatment of male erectile dysfunction in Colombia, Ecuador, and Venezuela: a double-blind, multicenter, placebo-controlled study. : International journal of impotence research. 20030122.