APA

Steen L. A., National Research Council U.S, . (1990). On the shoulders of giants: new approaches to numeracy. Washington, D.C: National Academy Press.

Chicago

Steen Lynn Arthur, National Research Council U.S, . 1990. On the shoulders of giants: new approaches to numeracy. Washington, D.C: National Academy Press.

Harvard

Steen L. A., National Research Council U.S, . (1990). On the shoulders of giants: new approaches to numeracy. Washington, D.C: National Academy Press.

MLA

Steen Lynn Arthur, National Research Council U.S, . On the shoulders of giants: new approaches to numeracy. Washington, D.C: National Academy Press. 1990.