APA (7th ed.) Citation

Spooner, G. (1963). Mathematics enrichment: Numeration. Harcourt.

Chicago Style (17th ed.) Citation

Spooner, George. Mathematics Enrichment: Numeration. New York: Harcourt, 1963.

MLA (9th ed.) Citation

Spooner, George. Mathematics Enrichment: Numeration. Harcourt, 1963.