Taylor, J. G. (1974). Black holes: The end of the universe? Fontana/Collins.
Lua i Stíl Chicago (17ú heag.)Taylor, John Gerald. Black Holes: The End of the Universe? New York: Fontana/Collins, 1974.
Lua MLA (8ú heag.)Taylor, John Gerald. Black Holes: The End of the Universe? Fontana/Collins, 1974.
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