Study Design VI - Ecological Studies.

MLA

Levin, Kate Ann. “Study Design VI - Ecological Studies.” Evidence-Based Dentistry, vol. 7, no. 4, Dec. 2006, p. 108. EBSCOhost, https://doi.org/10.1038/sj.ebd.6400454.

APA

Levin, K. A. (2006). Study Design VI - Ecological Studies. Evidence-Based Dentistry, 7(4), 108. https://doi.org/10.1038/sj.ebd.6400454

Chicago

Levin, Kate Ann. 2006. “Study Design VI - Ecological Studies.” Evidence-Based Dentistry 7 (4): 108. doi:10.1038/sj.ebd.6400454.