^Weisser, Thomas (1992) [1961–1977]. Spaghetti Westerns: the Good, the Bad and the Violent — 558 Eurowesterns and Their Personnel. Jefferson, N.C.: McFarland Publishing. p. 363-461.
^Riling, Yngve P (2011). The Spaghetti Western Bible. Limited Edition. Riling. p. 346-453.
^Weisser, Thomas (1992) [1961–1977]. Spaghetti Westerns: the Good, the Bad and the Violent — 558 Eurowesterns and Their Personnel. Jefferson, N.C.: McFarland Publishing. p. 363-461.
^Riling, Yngve P (2011). The Spaghetti Western Bible. Limited Edition. Riling. p. 346-453.