APA Citatie

Ebbinghaus, H., & Ewing, J. H. (1990). Numbers. Springer-Verlag.

Chicago Style citaat

Ebbinghaus, Heinz-Dieter, en John H. Ewing. Numbers. New York: Springer-Verlag, 1990.

MLA citatie

Ebbinghaus, Heinz-Dieter, en John H. Ewing. Numbers. Springer-Verlag, 1990.