Dyfyniad APA

Comber, L. C., & Keeves, J. P. (1973). Science education in nineteen countries. Wiley & Sons.

Dyfyniad Arddull Chicago

Comber, L. C., and John P. Keeves. Science Education in Nineteen Countries. Wiley & Sons, 1973.

Dyfyniad MLA

Comber, L. C., and John P. Keeves. Science Education in Nineteen Countries. Wiley & Sons, 1973.

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