Nuffield-Chelsea Curriculum Trust & GCSE. (1988). Nuffield co-ordinated science: Biology worksheets. Longman.
Citazione stile Chigago Style (17a edizione)Nuffield-Chelsea Curriculum Trust e GCSE. Nuffield Co-ordinated Science: Biology Worksheets. England: Longman, 1988.
Citatione MLA (9a ed.)Nuffield-Chelsea Curriculum Trust e GCSE. Nuffield Co-ordinated Science: Biology Worksheets. Longman, 1988.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.