Hafstad, M. R., & Hafstad, G. E. (1944). Use without waste: Units on conservation. Webster Pub. Co..
Chicagoスタイル(17版)引用形式Hafstad, Margaret Riggs, , George Edwin Hafstad. Use Without Waste: Units on Conservation. St. Louis: Webster Pub. Co., 1944.
MLA(8版)引用形式Hafstad, Margaret Riggs, , George Edwin Hafstad. Use Without Waste: Units on Conservation. Webster Pub. Co., 1944.
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