Cita APA

Liu, A. H. (2004). The hygiene hypothesis: Promises and pitfalls. Prim Care Respir J.

Chicago Style Citation

Liu, Andrew H. "The Hygiene Hypothesis: Promises and Pitfalls." Prim Care Respir J 2004.

Cita MLA

Liu, Andrew H. "The Hygiene Hypothesis: Promises and Pitfalls." Prim Care Respir J 2004.

Atenció: Aquestes cites poden no estar 100% correctes.