Glenn, J. (1964). Letters to John Glenn. World Book Encyclopedia Science Service; book trade distribution by Doubleday.
Citace podle Chicago (17th ed.)Glenn, John. Letters to John Glenn. Houston, Tex: World Book Encyclopedia Science Service; book trade distribution by Doubleday, 1964.
Citace podle MLA (9th ed.)Glenn, John. Letters to John Glenn. World Book Encyclopedia Science Service; book trade distribution by Doubleday, 1964.
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