Dyfyniad APA

Nuffield-Chelsea Curriculum Trust & GCSE. (1988). Nuffield co-ordinated science: Biology worksheets. Longman.

Dyfyniad Arddull Chicago

Nuffield-Chelsea Curriculum Trust and GCSE. Nuffield Co-ordinated Science: Biology Worksheets. England: Longman, 1988.

Dyfyniad MLA

Nuffield-Chelsea Curriculum Trust and GCSE. Nuffield Co-ordinated Science: Biology Worksheets. Longman, 1988.

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