Dyfyniad APA

World Bank & ebrary, Inc. (2012). The little data book: 2012. World Bank.

Dyfyniad Arddull Chicago

World Bank and Inc ebrary. The Little Data Book: 2012. Washington, D.C.: World Bank, 2012.

Dyfyniad MLA

World Bank and Inc ebrary. The Little Data Book: 2012. World Bank, 2012.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.