एपीए उद्धरण

Richardson, H. (1969). Elements of regional economics. Penguin books.

शिकागो स्टाइल उद्धरण

Richardson, H.W. Elements of Regional Economics. England: Penguin books, 1969.

एमएलए उद्धरण

Richardson, H.W. Elements of Regional Economics. Penguin books, 1969.