एपीए उद्धरण

(1981). World English: Workbook. Washington, DC.: United states Department of state.

शिकागो स्टाइल उद्धरण

World English: Workbook. Washington, DC.: United states Department of state, 1981.

एमएलए उद्धरण

World English: Workbook. Washington, DC.: United states Department of state, 1981.