Παραπομπή APA

Nobbs, J. (1973). Economics for advanced level. M.C. Graw hill.

Παραπομπή Chicago Style

Nobbs, J.P.Jacks. Economics for Advanced Level. London: M.C. Graw hill, 1973.

Παραπομπή MLA

Nobbs, J.P.Jacks. Economics for Advanced Level. M.C. Graw hill, 1973.