Cita APA (7a ed.)

Hafstad, M. R., & Hafstad, G. E. (1944). Use without waste: Units on conservation. Webster Pub. Co..

Cita Chicago Style (17a ed.)

Hafstad, Margaret Riggs, y George Edwin Hafstad. Use Without Waste: Units on Conservation. St. Louis: Webster Pub. Co., 1944.

Cita MLA (8a ed.)

Hafstad, Margaret Riggs, y George Edwin Hafstad. Use Without Waste: Units on Conservation. Webster Pub. Co., 1944.