Källén, B. The Problem of Confounding in Studies of the Effect of Maternal Drug Use on Pregnancy Outcome. Wiley.
Chicago Style (17th ed.) CitationKällén, Bengt. The Problem of Confounding in Studies of the Effect of Maternal Drug Use on Pregnancy Outcome. Wiley.
MLA (9th ed.) CitationKällén, Bengt. The Problem of Confounding in Studies of the Effect of Maternal Drug Use on Pregnancy Outcome. Wiley.
Warning: These citations may not always be 100% accurate.