Cita APA

Ringenberg, L. A. 1. (1960). A Portrait of 2; a: Brief survey of the elementary number systems. Washington: National Council of Teachers of Mathematics.

Citación estilo Chicago

Ringenberg, Lawrence Albert 1915-. A Portrait of 2; A: Brief Survey of the Elementary Number Systems. Washington: National Council of Teachers of Mathematics, 1960.

Cita MLA

Ringenberg, Lawrence Albert 1915-. A Portrait of 2; A: Brief Survey of the Elementary Number Systems. Washington: National Council of Teachers of Mathematics, 1960.