Porciuncula, N. J. (1980). Fourth grade difficulties in dividing whole numbers.
Cita Chicago (17th ed.)Porciuncula, Nelia Jesuitas. Fourth Grade Difficulties in Dividing Whole Numbers. 1980.
Cita MLA (9th ed.)Porciuncula, Nelia Jesuitas. Fourth Grade Difficulties in Dividing Whole Numbers. 1980.
Atenció: Aquestes cites poden no estar 100% correctes.