Contemporary Whitehead Advertisments:

Aircraft, May 1910, p.119

Aircraft, May 1910, p.117

Aircraft, June 1910, p.163

Aircraft, June 1910, p.158

Aeronautics, July, 1910

Aircraft, July 1910, p.200

Aircraft, July 1910, p.195

Aircraft, August, 1910, p.232

Aircraft, Sept. 1910, p.269

Aeronautics, October 1910

Aeronautics, December 1910

1912, Atmos L'Annuaire de L'Air, Switzerland