Cita APA (7th ed.)

Gustafson, A. F., Ries, H., Guise, C. H., & Hamilton, W. J. (1949). Conservation in the United States: A. F. Gustafson, H. Ries, C. H. Guise, [and] W. J. Hamilton, Jr. Comstock publishing company.

Cita Chicago (17th ed.)

Gustafson, Axel Ferdinand, Heinrich Ries, Cedric Hay Guise, i William John Hamilton. Conservation in the United States: A. F. Gustafson, H. Ries, C. H. Guise, [and] W. J. Hamilton, Jr. Ithaca, N. Y: Comstock publishing company, 1949.

Cita MLA (9th ed.)

Gustafson, Axel Ferdinand, et al. Conservation in the United States: A. F. Gustafson, H. Ries, C. H. Guise, [and] W. J. Hamilton, Jr. Comstock publishing company, 1949.