एपीए उद्धरण

Duff, U. G. (1935). Constructive eugenics and rational marriage.

शिकागो स्टाइल उद्धरण

Duff, Ursula Grant. Constructive Eugenics and Rational Marriage. 1935.

एमएलए उद्धरण

Duff, Ursula Grant. Constructive Eugenics and Rational Marriage. 1935.