
zitieren
to quote
To reproduce the words of another person or a passage of text word for word.
In seiner Rede zitierte der Politiker oft aus der Verfassung.
In his speech, the politician often quoted from the constitution.
to quote / summon
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to quote
To reproduce the words of another person or a passage of text word for word.
In seiner Rede zitierte der Politiker oft aus der Verfassung.
In his speech, the politician often quoted from the constitution.

to summon
To officially require someone to appear before an authority or a court.
Der Hauptzeuge wurde für nächsten Dienstag vor Gericht zitiert.
The main witness was summoned to court for next Tuesday.
The verb 'zitieren' (to quote/summon) usually takes an accusative object that indicates what or whom one is quoting or summoning. The source from which something is quoted is often added with the preposition 'aus' (from) and the dative.
Er zitierte einen berühmten Dichter.
He quoted a famous poet.
The verb 'zitieren' (to quote/summon) belongs more to written language and formal usage. It is often used in academic papers, journalism, and official speeches.
Der Professor zitierte mehrere Studien, um seine These zu stützen.
The professor quoted several studies to support his thesis.
In the meaning 'wörtlich wiedergeben' (to reproduce word for word), 'zitieren' (to quote) is often combined with sources and texts. Typical phrases are 'einen Autor zitieren' (to quote an author), 'aus einem Buch zitieren' (to quote from a book), or 'eine Studie zitieren' (to cite a study).
Im Aufsatz müssen Sie die Quellen korrekt zitieren.
In the essay, you must cite the sources correctly.
You can recognize the meaning 'vorladen' (to summon) from the context. It is almost always used together with places like 'Gericht' (court) or 'Behörde' (authority). The person who is supposed to appear is in the accusative.
Man hat ihn als Zeugen vor das Gericht zitiert.
He was summoned to court as a witness.
to lead / cite / trick
Both words can refer to using someone else's words or a text as evidence. Zitieren means reproducing the words exactly, whereas anführen is more general: it names an example, reason, or piece of evidence and does not have to be a literal quotation. Use zitieren for exact original wording and often anführen for a piece of evidence that is mentioned.

In ihrem Vortrag zitierte Lea genau die Worte der Autorin.
In her presentation, Lea quoted the author's exact words.
In ihrem Vortrag führte Lea die Studie als Beweis für ihre Meinung an.
In her presentation, Lea cited the study as evidence for her opinion.