Não informado. (1952). Elementary school science bulletin. National Science Teachers Association.
Chicagoスタイル(17版)引用形式Não informado. Elementary School Science Bulletin. Washington: National Science Teachers Association, 1952.
MLA(8版)引用形式Não informado. Elementary School Science Bulletin. National Science Teachers Association, 1952.
警告: この引用は必ずしも正確ではありません.