Ruf, J. (2013). Negative call prices.
Lua i Stíl Chicago (17ú heag.)Ruf, J. Negative Call Prices. 2013.
Lua MLA (9ú heag.)Ruf, J. Negative Call Prices. 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)