General Certificate of Secondary Education & Suffolk County Council. (1987). Co-ordinated science lesson notes: Biology. Collins Educational.
Παραπομπή σε μορφή Chicago (17η εκδ.)General Certificate of Secondary Education και Suffolk County Council. Co-ordinated Science Lesson Notes: Biology. London: Collins Educational, 1987.
Παραπομπή σε μορφή MLA (9th εκδ.)General Certificate of Secondary Education και Suffolk County Council. Co-ordinated Science Lesson Notes: Biology. Collins Educational, 1987.
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