Fletcher, H. (1970). Mathematics for schools: An integrated series : level I. Addison-Wesley.
Chicago-referens (17:e uppl.)Fletcher, Harold. Mathematics for Schools: An Integrated Series : Level I. London: Addison-Wesley, 1970.
MLA-referens (9:e uppl.)Fletcher, Harold. Mathematics for Schools: An Integrated Series : Level I. Addison-Wesley, 1970.
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