Não informado. Educators guide to free filmstrips. Educators Progress Service.
Chicagoスタイル(17版)引用形式Não informado. Educators Guide to Free Filmstrips. Randolph, Wis: Educators Progress Service.
MLA(8版)引用形式Não informado. Educators Guide to Free Filmstrips. Educators Progress Service.
警告: この引用は必ずしも正確ではありません.