Dyfyniad APA

Eckholm, E. P. (1977). The picture of health: Environmental sources of disease (First edition.). Norton.

Dyfyniad Arddull Chicago

Eckholm, Erik P. The Picture of Health: Environmental Sources of Disease. First edition. New York: Norton, 1977.

Dyfyniad MLA

Eckholm, Erik P. The Picture of Health: Environmental Sources of Disease. First edition. Norton, 1977.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.