Mae, A., & Ritchie, D. (1971). Science for the 70's: Book two (full-colour ed.). Heinemann Educational Books.
Citace podle Chicago (17th ed.)Mae, A.J, a David Ritchie. Science for the 70's: Book Two. full-colour ed. London: Heinemann Educational Books, 1971.
Citace podle MLA (9th ed.)Mae, A.J, a David Ritchie. Science for the 70's: Book Two. full-colour ed. Heinemann Educational Books, 1971.
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