Dyfyniad APA

Covey, L. S., Joseph, A. M., & Shoptaw, S. (2003). Response: Getting Tough with Smoking. National Institute on Drug Abuse.

Dyfyniad Arddull Chicago

Covey, Lirio S., Anne M. Joseph, and Steven Shoptaw. Response: Getting Tough With Smoking. National Institute on Drug Abuse, 2003.

Dyfyniad MLA

Covey, Lirio S., Anne M. Joseph, and Steven Shoptaw. Response: Getting Tough With Smoking. National Institute on Drug Abuse, 2003.

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