Marshall, G. (1976). Maths on target 2: A world of mathematics. Marshall.
Lua i Stíl Chicago (17ú heag.)Marshall, G. Maths on Target 2: A World of Mathematics. Kenya: Marshall, 1976.
Lua MLA (9ú heag.)Marshall, G. Maths on Target 2: A World of Mathematics. Marshall, 1976.
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