एपीए उद्धरण

Cordero Cordero, G. (1980). Cyclical and linear conception of history.

शिकागो स्टाइल उद्धरण

Cordero Cordero, Gerardo. Cyclical and Linear Conception of History. 1980.

एमएलए उद्धरण

Cordero Cordero, Gerardo. Cyclical and Linear Conception of History. 1980.