APA

National Institutes of Health (U.S.), . (19). Primero los pies (feet first): booklet about feet care. [Washington, D.C: .

Chicago

National Institutes of Health (U.S.), . 19. Primero los pies (feet first): booklet about feet care. [Washington, D.C: .

Harvard

National Institutes of Health (U.S.), . (19). Primero los pies (feet first): booklet about feet care. [Washington, D.C: .

MLA

National Institutes of Health (U.S.), . Primero los pies (feet first): booklet about feet care. [Washington, D.C: . 19.