APA

Chambers R., Weale M. R. & Youll R.The average earnings index. : .

Chicago

Chambers Ray, Weale Martin R and Youll Robin.The average earnings index. : .

Harvard

Chambers R., Weale M. R. and Youll R.The average earnings index. : .

MLA

Chambers Ray, Weale Martin R and Youll Robin.: . .