Citations for a book - What does "exact date of retrieval" mean?

Citations for a book - What does "exact date of retrieval" mean?I contributed to a book and thought my citations were appropriate. Here's just one example:

American Cancer Society. (2007). Quitline. Retrieved from www.cancer.org/docroot/PED/content/PED_10_5_IX_ Quitline_Partnerships.asp?sicearea=PED.

Editor note asks "exact date of retrieval." What is she looking for here? The day I went online and got it... or is it something else?

Thanks

pheemz
When citing online sources you should put the date you accessed it, as pages can and do change frequently.

H6
The date you viewed it online.

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