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.

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 strive / to trouble
'zitieren' and 'bemühen' can both occur when you rely on a text, an example, or a quote. 'zitieren' means to reproduce someone else's words word for word. 'etwas bemühen' means more like using an example, comparison, or quote to support your own statement. It does not always have to be word for word. The words can be confused because you can both 'zitieren' and 'bemühen' a quote. 'zitieren' is more precise for the exact wording. 'bemühen' often sounds more formal and describes the function more: you draw on something for explanation or justification.

In ihrer Präsentation zitiert Anna einen Satz aus dem Buch.
In her presentation, Anna quotes a sentence from the book.
Um seine Meinung zu erklären, bemüht der Redner ein bekanntes Beispiel aus der Geschichte.
To explain his opinion, the speaker invokes a well-known example from history.