Dyfyniad APA

Sayad, B. W., & Sayad, B. W. (1997). An invitation to health: The power of prevention (7th ed.). Brooks/Cole Pub..

Dyfyniad Arddull Chicago

Sayad, Barbara W., and Barbara Werner Sayad. An Invitation to Health: The Power of Prevention. 7th ed. Pacific Grove, CA: Brooks/Cole Pub., 1997.

Dyfyniad MLA

Sayad, Barbara W., and Barbara Werner Sayad. An Invitation to Health: The Power of Prevention. 7th ed. Brooks/Cole Pub., 1997.

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