Nellis , J. (1997). The essence of the economy (2nd.). PHI.
Lua i Stíl Chicago (17ú heag.)Nellis , Joseph. The Essence of the Economy. 2nd. New Delhi: PHI, 1997.
Lua MLA (9ú heag.)Nellis , Joseph. The Essence of the Economy. 2nd. PHI, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.