Dyfyniad APA

Fries, J. F. (1989). Aging well: A guide for successful seniors. Addison-Wesley.

Dyfyniad Arddull Chicago

Fries, James F. Aging Well: A Guide for Successful Seniors. Reading, MA: Addison-Wesley, 1989.

Dyfyniad MLA

Fries, James F. Aging Well: A Guide for Successful Seniors. Addison-Wesley, 1989.

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