Watson, T., & Quinn, T. (1969). Making sure of maths. Holmes McDougall.
Lua i Stíl Chicago (17ú heag.)Watson, T.F, agus T.A Quinn. Making Sure of Maths. Holmes McDougall, 1969.
Lua MLA (8ú heag.)Watson, T.F, agus T.A Quinn. Making Sure of Maths. Holmes McDougall, 1969.
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