Eastham, J. (1960). Graphical economics. Eng. Univ. Press.
Lua i Stíl Chicago (17ú heag.)Eastham, J. Graphical Economics. London: Eng. Univ. Press, 1960.
Lua MLA (9ú heag.)Eastham, J. Graphical Economics. Eng. Univ. Press, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.