Cita APA

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

Chicago Style Citation

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

Cita MLA

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

Atenció: Aquestes cites poden no estar 100% correctes.