Fuentes consultadas1. Spanish colonial fortifications in North America 1565-1822, 2010 Port. (Stephen Walsh)
2. The US Army of World War I, 2003 Port. (Stephen Walsh)
3. WWW LC Authorities, 06/11/2023 (Stephen Walsh; n. en 1966 en Macclesfield, Reino Unido; ilustrador; otras formas: Steve Walsh)