Okada, S. (2000). Mathematics for elementary school, 1st grade. Gakkoh Tosho.
Cita Chicago (17th ed.)Okada, Shigeru. Mathematics for Elementary School, 1st Grade. Tokio: Gakkoh Tosho, 2000.
Cita MLA (9th ed.)Okada, Shigeru. Mathematics for Elementary School, 1st Grade. Gakkoh Tosho, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.