Dyfyniad APA

Ryan, M. (1990). USSR letter. Creating an association of Soviet doctors.

Dyfyniad Arddull Chicago

Ryan, M. USSR Letter. Creating an Association of Soviet Doctors. 1990.

Dyfyniad MLA

Ryan, M. USSR Letter. Creating an Association of Soviet Doctors. 1990.

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