Dyfyniad APA

Friis, R. H., & Sellers, T. A. (2009). Epidemiology for public health practice (4th ed.). Jones and Bartlett Publishers.

Dyfyniad Arddull Chicago

Friis, Robert H., and Thomas A. Sellers. Epidemiology for Public Health Practice. 4th ed. Sudbury, Mass.: Jones and Bartlett Publishers, 2009.

Dyfyniad MLA

Friis, Robert H., and Thomas A. Sellers. Epidemiology for Public Health Practice. 4th ed. Jones and Bartlett Publishers, 2009.

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