Cita APA (7a ed.)

Lobachevski, N., & Halsted, G. B. (1955). Geometrical researches on the theory of parallels. Dover Publications.

Cita Chicago Style (17a ed.)

Lobachevski, Nicholas, y George Bruce Halsted. Geometrical Researches on the Theory of Parallels. /New York/: Dover Publications, 1955.

Cita MLA (8a ed.)

Lobachevski, Nicholas, y George Bruce Halsted. Geometrical Researches on the Theory of Parallels. Dover Publications, 1955.