Dyfyniad APA

Katz, D. L., & Jekel, J. F. (2014). Jekel's epidemiology, biostatistics, preventive medicine, and public health (4th ed.). Saunders.

Dyfyniad Arddull Chicago

Katz, David L., and James F. Jekel. Jekel's Epidemiology, Biostatistics, Preventive Medicine, and Public Health. 4th ed. Philadelphia, Pa. ; London: Saunders, 2014.

Dyfyniad MLA

Katz, David L., and James F. Jekel. Jekel's Epidemiology, Biostatistics, Preventive Medicine, and Public Health. 4th ed. Saunders, 2014.

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