Dyfyniad APA

Welch, J. P. (1976). Points from letters: Smoking and congenital deformities.

Dyfyniad Arddull Chicago

Welch, J P. Points From Letters: Smoking and Congenital Deformities. 1976.

Dyfyniad MLA

Welch, J P. Points From Letters: Smoking and Congenital Deformities. 1976.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.