Mercer, 1999. Mercer, Mike (1 de marzo de 1999). «New era of mine haul truck giants». Diesel Progress North American Edition. Diesel Progress. Archivado desde el original el 2 de marzo de 2010. Consultado el 1 de marzo de 2010. «As early as 1973 Terex developed a three-axle, 350-ton hauler...»
Hoppe, 1978, p. 217. Hoppe, Richard, ed. (1 de julio de 1978). E/MJ Operating Handbook of Mineral Surface Mining and Exploration. E/MJ Library of Operating Handbook. Vol. 2 (Hardcover edición). New York, New York, United States: McGraw-Hill Higher Education. ISBN978-0-07-019518-9. Consultado el 8 de abril de 2011. «A prototype of the 33-19 has been operating at Kaiser Steel's Eagle Mountain iron mine in California since January 1975.»
Woof, 2006, p. 26. Woof, Mike (24 de marzo de 2006). Hitch, Lindsay; Gansen, Steve, eds. Ultra Haulers: Global Giants of the Mining Industry. United States of America: MBI. ISBN978-0-7603-2381-6. Consultado el 1 de marzo de 2010. «...the 33-19, which offered a 350-U.S.-ton/316-tonne capacity that would not be surpassed for over 20 years.»
The Age, 1975, p. 19. «350-tonne haulers startle industry». The Age (Melbourne, Victoria, Australia: Fairfax Media). 19 de mayo de 1975. Earth Moving Feature. Consultado el 15 de marzo de 2010. «...the Titan had been engineered and built to meet the present and future demands of the open pit mining industry for more efficient high-production capacity haulers...»
Mercer, 1999. Mercer, Mike (1 de marzo de 1999). «New era of mine haul truck giants». Diesel Progress North American Edition. Diesel Progress. Archivado desde el original el 2 de marzo de 2010. Consultado el 1 de marzo de 2010. «As early as 1973 Terex developed a three-axle, 350-ton hauler...»