Não informado. (1905). School science and mathematics. School Science and Mathematics Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. School Science and Mathematics. Menasha, Wis: School Science and Mathematics Association, 1905.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. School Science and Mathematics. School Science and Mathematics Association, 1905.
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