(1957). Arithmetic learning activities.
Chicago Style (17. basım) AtıfArithmetic Learning Activities. 1957.
MLA (9th ed.) AtıfArithmetic Learning Activities. 1957.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..
(1957). Arithmetic learning activities.
Chicago Style (17. basım) AtıfArithmetic Learning Activities. 1957.
MLA (9th ed.) AtıfArithmetic Learning Activities. 1957.