Lobachevski, N. (1914). Geometrical researches on the theory of parallels. Open Court Publishing Company.
Citazione stile Chigago Style (17a edizione)Lobachevski, Nicholas. Geometrical Researches on the Theory of Parallels. LaSalle: Open Court Publishing Company, 1914.
Citatione MLA (9a ed.)Lobachevski, Nicholas. Geometrical Researches on the Theory of Parallels. Open Court Publishing Company, 1914.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.