Não informado. (1930). Extension service review. Science and Education Administration.
Chicagoスタイル(17版)引用形式Não informado. Extension Service Review. Washington: Science and Education Administration, 1930.
MLA(8版)引用形式Não informado. Extension Service Review. Science and Education Administration, 1930.
警告: この引用は必ずしも正確ではありません.