Chicago Author-Date Citation Style

Web Page

Include a publication date or date of revision or modification; if no such date can be determined, include an access date and put "n.d." for no date after the author.

Reference list

Zellers, Joanne M. 2010. "African Peoples' Encounters With Others." Africana Collections: An Illustrated Guide. Last modified November 15, 2010. http://www.loc.gov/rr/amed/guide/afr-encounters.html.

Schoodic Institute. n.d. "Bird Ecology." Accessed April 4, 2020. https://schoodicinstitute.org/science/bird-ecology-research.

In text citation

(Schoodic Institute, n.d.)

Blog 

Citations of blog entries are generally relegated to the notes; a frequently cited blog, however, may be included in the bibliography.