APA Citation

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

Chicago Style Citation

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

MLA Citation

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

Warning: These citations may not always be 100% accurate.