एपीए उद्धरण

Sapsford,David, & Ladd,James. (1978). Essential economics. Hart-Davis Educational.

शिकागो स्टाइल उद्धरण

Sapsford,David, और Ladd,James. Essential Economics. Great Britain: Hart-Davis Educational, 1978.

एमएलए उद्धरण

Sapsford,David, और Ladd,James. Essential Economics. Hart-Davis Educational, 1978.