ARNY, T. T. S. (2020). Explorations: : an introduction to astronomy. McGraw Hill Education.
Lua i Stíl Chicago (17ú heag.)ARNY, Thomas T. Schneider. Explorations: : An Introduction to Astronomy. McGraw Hill Education, 2020.
Lua MLA (9ú heag.)ARNY, Thomas T. Schneider. Explorations: : An Introduction to Astronomy. McGraw Hill Education, 2020.
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