: Re: Cite letter and article separately even though both are on the same webpage? I am writing a formal research paper (for a competition called National History Day), using the Chicago citation style.

@Speyer920

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The letter is a primary source, as you already know. This is the actual artifact, the letter the young woman received from NASA.

The article about the history of these events is a secondary source; it's not a record of the events itself but a description. (It might actually be a tertiary source, but you could make the case for secondary.) This article explains more about primary, secondary, and tertiary sources. It's not part of CMOS but appears to be from a university that uses CMOS as its standard.

If you are using the article only to provide access to the letter, then you cite the letter while crediting the publication:

Lloyd, Jr., O. B., O. B. Lloyd, Jr. to Linda Halpern, March 13, 1962, in [... cite article here]

See "a letter found on a website" in these Chicago citation guidelines.

If you are also using the article in other ways, and not just as your source for the letter, then cite the article itself where you use it.

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