APA

National Cancer Institute (U.S.), . (2002). Youth access to tobacco: number of states with enacted youth access to tobacco sale. Bethesda,MD: State cancer Legislative Database Program.

Chicago

National Cancer Institute (U.S.), . 2002. Youth access to tobacco: number of states with enacted youth access to tobacco sale. Bethesda,MD: State cancer Legislative Database Program.

Harvard

National Cancer Institute (U.S.), . (2002). Youth access to tobacco: number of states with enacted youth access to tobacco sale. Bethesda,MD: State cancer Legislative Database Program.

MLA

National Cancer Institute (U.S.), . Youth access to tobacco: number of states with enacted youth access to tobacco sale. Bethesda,MD: State cancer Legislative Database Program. 2002.