1910 NATIONAL National magazine AD 1895-1930 The Wonderful World of AUTOMOBILES Edited By Joseph J Schroeder, Jr., 1971 ISBN: 0-695-80223-2 page 108
1910 NATIONAL National The “40” — $2,500 SPEED, POWER, STYLE, PRESTIGE NATIONAL MOTOR VEHICLE COMPANY Indianapolis, IND THE MOTOR WORLD 1910 8.25″x11.5″ page 197
1910 NATIONAL THE GREAT ELGIN ROAD RACES by Edward F. Gathman ANTIQUE AUTOMOBILE JULY-AUGUST 1970 AACA Library page 15