1. Waldron, R.A.: The Wave and Ballistic Theories of Light—a Critical Review, (Frederick Muller, London 1977)
2. Dingle, H.: Science at the Crossroads, (Martin Brian and O'Keeffe, London 1972)
3. Parish, L.: The Logical Fallacies of Einsteinian Relativity, (Luton 1977)
4. Palacios, J.: Relatividad—una Nueva Teoria, (Espasa-Calpe, Madrid 1960)