APA (7th ed.) Citation

Green, R. T., & Laxon, V. J. (1978). Entering the world of number. Thames & Hudson.

Chicago Style (17th ed.) Citation

Green, Robert T., and Veronica J. Laxon. Entering the World of Number. [London]: Thames & Hudson, 1978.

MLA (9th ed.) Citation

Green, Robert T., and Veronica J. Laxon. Entering the World of Number. Thames & Hudson, 1978.