-. The Journal of the American Medical Association, Vol. 163 No. 1-14, January-April 1957. American Medical Association.
Dyfyniad Arddull Chicago-. The Journal of the American Medical Association, Vol. 163 No. 1-14, January-April 1957. American Medical Association.
Dyfyniad MLA-. The Journal of the American Medical Association, Vol. 163 No. 1-14, January-April 1957. American Medical Association.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.