Lua APA (7ú heag.)

Kagan, V. F. (1944). Lobachevskiĭ.

Lua i Stíl Chicago (17ú heag.)

Kagan, V. F. Lobachevskiĭ. Moskva, 1944.

Lua MLA (8ú heag.)

Kagan, V. F. Lobachevskiĭ. 1944.

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