Zim, H. S. (1953). Science for children and teachers. Association for Childhood Education International.
Cita Chicago (17th ed.)Zim, Herbert Spencer. Science for Children and Teachers. Washington: Association for Childhood Education International, 1953.
Cita MLA (9th ed.)Zim, Herbert Spencer. Science for Children and Teachers. Association for Childhood Education International, 1953.
Atenció: Aquestes cites poden no estar 100% correctes.