A secondary citation carries somebody else's reading
If writer B reports a statement by writer A and you have only read B, you do not know A directly. B may have shortened, translated, sharpened or relocated the passage. Even an accurate quotation does not reveal every definition, method or qualification in the original. Your prose must preserve that evidential distance.
Famous sayings, historical statistics and definitions often pass through many publications. A page number may refer to a different edition; translations can diverge; text presented as verbatim may already be a paraphrase. The more important the claim, the stronger the case for retrieving the source or a reliable scholarly edition.
Make a structured attempt to obtain the original
Start with the fullest metadata in the source you read: creator, title, year, journal or publisher, volume, pages and identifiers. Search title variants in a library catalogue, union catalogue, subject database and DOI registry. Inspect institutional repositories, legitimate open-access versions, digital collections and author pages. A translated chapter or later edition may appear under another title.
Use interlibrary loan, document supply and a librarian's enquiry service. Ask whether the department has a local or archival holding. If the work exists in a language you cannot read, “unavailable” and “not readable by me” are different problems; look for an authorised translation or appropriate scholarly support. Record search routes and date so that the exception can be explained.
Ask whether the inherited statement is essential
Sometimes the indirect quotation merely decorates a paragraph with a famous origin. It may be more accurate to paraphrase B directly or use a contemporary primary study. If your question concerns how B interpreted A, then B is itself the primary source for that reception. Describe the object of analysis accordingly.
For an empirical claim, do not make one secondary account carry the evidence alone. Look for datasets, later studies or reviews that test it independently. For a historical work, a critical edition may be closer to the text than a general modern textbook. Evaluate why B cites A, whether the passage is complete and whether B has relevant expertise.
Align the in-text form with the reference list
A common pattern is “A (year, as cited in B, year, page)”. Punctuation differs among APA, author-date systems and note styles. The page for B identifies the location you inspected. If B supplies a page in A, report it only in a way that does not imply direct access.
Many styles list B alone because it is the work consulted. Some disciplines require fuller information about A in a note or bibliography. Apply the binding rule consistently. Mark “original not consulted” in your reading notes so the distinction cannot disappear when references are edited months later.
Treat quotations, translations and visual material with extra care
A quotation at second hand carries two opportunities for transcription error. If it is indispensable, reproduce exactly the version in B and mark the indirect route. Do not silently modernise spelling. State whose translation you are quoting. Tables, formulae and figures are particularly poor candidates because formatting, captions and omitted cells may alter meaning.
If the original later becomes available, replace the secondary citation after reading it. Compare context and wording and correct the surrounding argument. Our guide to primary, secondary and tertiary sources helps classify the roles rather than the format.
Document why the exception does not control the argument
Keep a note identifying every proposition dependent on indirect evidence and ask what remains if it is removed. If an entire section rests on originals you have not seen, restructuring is usually safer than multiplying “as cited in” references. A small number of explicit exceptions is more credible than a seamless chain that overstates reading.
Where the secondary author disputes or qualifies the original, preserve that stance. Do not lift A's apparent words while dropping B's warning. In a literature review, code secondary citations separately so they are not counted as independent studies. This protects both attribution and the logic of the evidence synthesis.