APA (7e ed.) Bronvermelding

Shirokov, P. A., & Bronshtein, I. N. (1964). A sketch of the fundamentals of Lobachevskian geometry. P. Noordhoff.

Chicago (17e ed.) Bronvermelding

Shirokov, P. A., en I. N. Bronshtein. A Sketch of the Fundamentals of Lobachevskian Geometry. Groningen: P. Noordhoff, 1964.

MLA (8e ed.) Bronvermelding

Shirokov, P. A., en I. N. Bronshtein. A Sketch of the Fundamentals of Lobachevskian Geometry. P. Noordhoff, 1964.