Bristle Types and Bloom. Philip Watterson, Managing Director, Progress Shaving Brush (Vulfix) Ltd per Em's Place [Consulta: 2011.04.24 (en anglès)].Arxivat 2008-06-04 a Wayback Machine.
Bristle Types and Bloom. Philip Watterson, Managing Director, Progress Shaving Brush (Vulfix) Ltd per Em's Place [Consulta: 2011.04.24 (en anglès)].Arxivat 2008-06-04 a Wayback Machine.