Παραπομπή APA

Sturik, D. J. (1961). Lectures on classical differential geometry (23.).

Παραπομπή Chicago Style

Sturik, Dirk J. Lectures on Classical Differential Geometry. 23. Addison-Wesley Publishing Co. Inc., Massachusetts, 1961.

Παραπομπή MLA

Sturik, Dirk J. Lectures on Classical Differential Geometry. 23. 1961.