Dyfyniad APA

SHEPPARD P.M. (1960). NATURAL SELECTION AND HEREDITY. HARPER & BROTHERS, PUBLISHERS.

Dyfyniad Arddull Chicago

SHEPPARD P.M. NATURAL SELECTION AND HEREDITY. NEW YORK: HARPER & BROTHERS, PUBLISHERS, 1960.

Dyfyniad MLA

SHEPPARD P.M. NATURAL SELECTION AND HEREDITY. HARPER & BROTHERS, PUBLISHERS, 1960.

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