Cita APA

Fielding, D. W., & Walker, S. (1972). Dizygotic twins with Down's syndrome.

Citación estilo Chicago

Fielding, D W., y S. Walker. Dizygotic Twins With Down's Syndrome. 1972.

Cita MLA

Fielding, D W., y S. Walker. Dizygotic Twins With Down's Syndrome. 1972.