I would suggest using the numerous studies and compiled information in the document from directly from WHO on this subject as it can apply to hospital settings. Specifically the 10 Steps, as it supports the Code and how hospitals can support the Code through the 10 Steps. 

"This review summarizes studies related to each of the Ten Steps to Successful Breastfeeding and studies combining steps. As far as possible the authors included only experimental and quasi-experimental studies. The purpose of the document was to review the evidence for the efficacy of the "Ten Steps" and to provide a tool for advocacy and education. "

The section on infant formula, free samples and such is detailed with many cited studies.

World Health Organization. (1998). Evidence for the ten steps to successful breastfeeding (pp. 118): WHO

It is available in downloadable PDF format here:
http://www.who.int/child-adolescent-health/publications/NUTRITION/WHO_CHD_98.9.htm




Mirine R. Dye,
Community Doula, Childbirth and Lactation Educator
in the Rita-soaked Florida Keys and Key West

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