WIERSEMA, B., & ET AL. (1993). EFFECTS OF COOPERATION ON SPELLING ACHIEVEMENT AT THREE AGE LEVELS (GRADES 2, 4, AND 6).
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Chicago-čujuhus (17. p.)
WIERSEMA, B., juo ET AL. EFFECTS OF COOPERATION ON SPELLING ACHIEVEMENT AT THREE AGE LEVELS (GRADES 2, 4, AND 6). 1993.
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MLA-čujuhus (9. p.)
WIERSEMA, B., juo ET AL. EFFECTS OF COOPERATION ON SPELLING ACHIEVEMENT AT THREE AGE LEVELS (GRADES 2, 4, AND 6). 1993.
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