Add an in-text citation using MLA format.
In addition to the stress that most people face at their jobs, astronauts also face long-term isolation from the rest of the world, locked in a barren environment that they can't leave behind at the end of the day.
Source: Packing for Mars by Mary Roach, chapter 1, page 39. Published by W. W. Norton & Company, New York 2010:
The astronaut's job is stressful for all the same reasons yours or mine is—overwork, lack of sleep, anxiety, other people—but two things compound the usual stresses: the deprivations of the environment and one's inability to escape it.
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