Munroe, R. (2014). What if?: Serious scientific answers to absurd hypothetical questions / Randall Munroe. Houghton Mifflin Harcourt.
Lua i Stíl Chicago (17ú heag.)Munroe, Randall. What If?: Serious Scientific Answers to Absurd Hypothetical Questions / Randall Munroe. Boston: Houghton Mifflin Harcourt, 2014.
Lua MLA (8ú heag.)Munroe, Randall. What If?: Serious Scientific Answers to Absurd Hypothetical Questions / Randall Munroe. Houghton Mifflin Harcourt, 2014.
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