There are two ways to cite in Chicago style:
...according to Abdou1
1. Name Surname, Book Title in Italics (Place of publication: Publisher, Year), page number.
Surname, Name. Book Title in Italics. Place of publication: Publisher, Year.
... according to Koven1
1. Name Surname, "Title of Article: Subtitle," Title of Journal in Italics volume, issue no. (Year): page.
1. Suzanne Koven, "Mom at Bedside, Appears Calm," The New England Journal of Medicine 370, no. 2 (2014): 104.
Surname, Name. "Title of Article: Subtitle." Title of Journal in Italics volume, issue no. (Year): page range.
Koven, Suzanne. "Mom at Bedside, Appears Calm." The New England Journal of Medicine 370, no. 2 (2014): 104-105.
found in UNESCO website1
1. Name Surname, “Title of Web Page,” Title of Website, Publishing Organization, available publication or update date, otherwise access date, URL.
1.UNESCO, "UNESCO in Brief," UNESCO, September 5, 2018, https://en.unesco.org/about-us/introducing-unesco
Surname, Name. “Title of Web Page.” Title of Website. Publishing organization, available publication or update date. Otherwise access date. URL.
UNESCO. "UNESCO in Brief." UNESCO, September 5, 2018. https://en.unesco.org/about-us/introducing-unesco
A primary source can take various forms, it could be an image, a video, or a manuscript. For each form, you need to follow different rules in order to cite it. Here is an example of a speech found in an edited collection of primary sources
Check out Purdue OWL Chicago Style Guide to find out more.