Bruno, Leonard C. “Elevator.” The Gale Encyclopedia of Science, Edited by K. Lee Lerner and Brenda Wilmoth Lerner, 5th ed., vol. 3, Gale, Farmington Hills, MI, 2014, pp. 1564–1565, Gale Virtual Reference Library, http://go.galegroup.com/ps/i.do?p=gvrl&sw=w&u=pull21986&v=2.1&it=r&id=gale|cx3727800885&asid=26932a61e38faa1616ec82b9dfeeea45.
This is a relatively recent encyclopedia entry about the elevator. It includes the history of the elevator as well as a description of the modern elevator.
Steele, Gregory K. et al. “Elevator-Related Injuries to Older Adults in the United States, 1990 to 2006.” The Journal of Trauma: Injury, Infection, and Critical Care, vol. 68, no. 1, 2010, pp. 188–192. doi:10.1097/ta.0b013e3181b2302b.
This is a study published in a peer-reviewed academic journal that looks at the number of elevator-related injuries and compares these numbers to the demographics of the injured parties.
SPEEDING UP THE ELEVATOR FOR OUR TALLER SKYSCRAPERS. (1931, Apr 05).New York Times (1923-Current File) Retrieved from http://search.proquest.com/docview/99123876?accountid=14902
This discusses the new (at the time) innovations in elevator technology and looks at how they are being implemented.
Note about all: These are just the sources and a brief description of them. Annotated bibliographies to come!