Berry, M. (1944). Principles of cosmology and gravitation. Adam Hilger.
Lua i Stíl Chicago (17ú heag.)Berry, Michael. Principles of Cosmology and Gravitation. Bristol: Adam Hilger, 1944.
Lua MLA (9ú heag.)Berry, Michael. Principles of Cosmology and Gravitation. Adam Hilger, 1944.
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