Cita APA

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

Chicago Edition Citation

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

Cita MLA

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