[es] [Hector Cross 03] • El predador Emecé Editores, Buenos Aires
[en] [Hector Cross 01] • Those in Peril Macmillan
[en] [Gutenberg 57725] • Wright Brothers National Memorial, North Carolina Digital Scanning Inc
[en] [Henry Gresham 03] • The Coming of the King Peach Publishing
[en] [Gutenberg 38739] • The Wright Brothers' Engines and Their Design Independently Published
[en] Tom Petty Biography Digital Publishing Group