एपीए उद्धरण

Robinson, B. (1989). Focus: An ESL grammar. New York: St. Martin's Press.

शिकागो स्टाइल उद्धरण

Robinson, Barbara. Focus: An ESL Grammar. New York: St. Martin's Press, 1989.

एमएलए उद्धरण

Robinson, Barbara. Focus: An ESL Grammar. New York: St. Martin's Press, 1989.