Dyfyniad APA

Madison, B. L., & Hart, T. A. (1990). A challenge of numbers: People in the mathematical sciences. National Academy Press.

Dyfyniad Arddull Chicago

Madison, Bernard L., and Therese A. Hart. A Challenge of Numbers: People in the Mathematical Sciences. Washington, D.C.: National Academy Press, 1990.

Dyfyniad MLA

Madison, Bernard L., and Therese A. Hart. A Challenge of Numbers: People in the Mathematical Sciences. National Academy Press, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.