Lua APA (7ú heag.)

Butler, C. H. 1., & Wren, F. L. 1. (1960). The teaching of secondary mathematics (3d ed.). McGraw-Hill.

Lua i Stíl Chicago (17ú heag.)

Butler, Charles H. 1894, agus Frank Lynwood 1894 Wren. The Teaching of Secondary Mathematics. 3d ed. New York: McGraw-Hill, 1960.

Lua MLA (9ú heag.)

Butler, Charles H. 1894, agus Frank Lynwood 1894 Wren. The Teaching of Secondary Mathematics. 3d ed. McGraw-Hill, 1960.

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