| 1. | Christopher Frayling (2006), Spaghetti Westerns: Cowboys and Europeans from Karl May to Sergio Leone, I.B.Tauris, pp. 18, ISBN 9781845112073 2007, pp. 25 ↑ (en) Christopher Frayling, Spaghetti westerns : cowboys and Europeans from Karl May to Sergio Leone, Londres, I. B. Tauris & Co., 2006 (ISBN 9781845112073, lire en ligne). |