Known stretch limousine builders on Buick and Cadillac chassis at least in 1990.

The Henry Brothers grew up in Memphis, Tennessee and learned their craft at the Comet Coach Co. as high school students.

The Professional Car (Quarterly Journal of the Professional car Society)

Gregg D. Merksamer - Professional Cars: Ambulances, Funeral Cars and Flower Cars

Thomas A. McPherson - American Funeral Cars & Ambulances Since 1900

Carriage Museum of America - Horse-Drawn Funeral Vehicles: 19th Century Funerals

Carriage Museum of America -  Horse Drawn - Military, Civilian, Veterinary - Ambulances

Gunter-Michael Koch - Bestattungswagen im Wandel der Zeit

Walt McCall & Tom McPherson - Classic American Ambulances 1900-1979: Photo Archive

Walt McCall & Tom McPherson - Classic American Funeral Vehicles 1900-1980 Photo Archive

Walter M. P. McCall - The American Ambulance 1900-2002

Walter M.P. McCall - American Funeral Vehicles 1883-2003

Michael L. Bromley & Tom Mazza - Stretching It: The Story of the Limousine

Richard J. Conjalka - Classic American Limousines: 1955 Through 2000 Photo Archive

Richard J. Conjalka - Stretch Limousines 1928-2001 Photo Archive

Thomas A. McPherson - Eureka: The Eureka Company: a complete history

Thomas A. McPherson - Superior: The complete history

Thomas A. McPherson - Flxible: The Complete History

Thomas A. McPherson - Miller-Meteor: The Complete History

Robert R. Ebert  - Flxible: A History of the Bus and the Company

Hearses - Automobile Quarterly Vol 36 No 3

Marian Suman-Hreblay - Dictionary of World Coachbuilders and Car Stylists

Daniel D. Hutchins - Wheels Across America: Carriage Art & Craftsmanship

Marian Suman-Hreblay - Dictionary of World Coachbuilders and Car Stylists

Michael Lamm and Dave Holls - A Century of Automotive Style: 100 Years of American Car Design

Nick Georgano - The Beaulieu Encyclopedia of the Automobile: Coachbuilding

Marian Suman-Hreblay - Automobile Manufacturers Worldwide Registry

G.N. Georgano & G. Marshall Naul - The Complete Encyclopedia of Commercial Vehicles

Albert Mroz - Illustrated Encyclopedia of American Trucks & Commercial Vehicles

Beverly Rae Kimes & Henry Austin Clark Jr. - Standard Catalog of American Cars 1805-1942

John Gunnell - Standard Catalog of American Cars, 1946-1975

James M. Flammang & Ron Kowalke - Standard Catalog of American Cars, 1976-1999