एपीए उद्धरण

Heady, e. o. (1961). agricultural production funcion. Kalyani publications.

शिकागो स्टाइल उद्धरण

Heady, earl o. Agricultural Production Funcion. Ludhina: Kalyani publications, 1961.

एमएलए उद्धरण

Heady, earl o. Agricultural Production Funcion. Kalyani publications, 1961.