Photos: Detroit's early auto giants: Daredevils and mad mechanics
Packard's first postwar droptops - Old Cars Weekly
1914 Packard TWIN SIX 1-25 AND 1-35 Archives - Chuck's Toyland
MotorCities - Great Memories of Packard in Detroit, 2022
1920 Packard Series 3-35 Twin Six Seven-Passenger Touring
1919 Packard Twin Six - 1st Gen Market
1916 Packard Twin Six - 1st Gen Market
1914 Packard TWIN SIX 1-25 AND 1-35 Archives - Chuck's Toyland
Cylinder Wars – The Race to Develop an American V16 Engine – Heacock Classic
1920 Packard Twin Six - 1st Gen Market
1920 Packard Twin Six 3-35
Collector Car Corner: The demise of the Studebaker-Packard Corporation