Dyfyniad APA

Cetron, M., Keystone, J., Shlim, D., & Steffen, R. (1998). Travelers' health. Centers for Disease Control and Prevention.

Dyfyniad Arddull Chicago

Cetron, M., J. Keystone, D. Shlim, and R. Steffen. Travelers' Health. Centers for Disease Control and Prevention, 1998.

Dyfyniad MLA

Cetron, M., J. Keystone, D. Shlim, and R. Steffen. Travelers' Health. Centers for Disease Control and Prevention, 1998.

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