APA (7th ed.) Citation

Bengt Källén. (2012). The Problem of Confounding in Studies of the Effect of Maternal Drug Use on Pregnancy Outcome. Hindawi Limited.

Chicago Style (17th ed.) Citation

Bengt Källén. The Problem of Confounding in Studies of the Effect of Maternal Drug Use on Pregnancy Outcome. Hindawi Limited, 2012.

MLA (9th ed.) Citation

Bengt Källén. The Problem of Confounding in Studies of the Effect of Maternal Drug Use on Pregnancy Outcome. Hindawi Limited, 2012.

Warning: These citations may not always be 100% accurate.