Dyfyniad APA

Erikson, E. H., & Holton, G. J. (1972). The twentieth-century sciences: Studies in the biography off ideas. Norton.

Dyfyniad Arddull Chicago

Erikson, Erik H., and Gerald James Holton. The Twentieth-century Sciences: Studies in the Biography off Ideas. New York: Norton, 1972.

Dyfyniad MLA

Erikson, Erik H., and Gerald James Holton. The Twentieth-century Sciences: Studies in the Biography off Ideas. Norton, 1972.

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