एपीए उद्धरण

van Bergeijk, P. A. G. (2011). Gravity Model in International Trade: Advances and Applications. Cambridge University Press.

शिकागो स्टाइल उद्धरण

van Bergeijk, Peter A. G. Gravity Model in International Trade: Advances and Applications. Cambridge University Press, 2011.

एमएलए उद्धरण

van Bergeijk, Peter A. G. Gravity Model in International Trade: Advances and Applications. Cambridge University Press, 2011.