"The standard practice in academe is to credit other people when using
their work. This applies to all work including that done, transmitted
or stored digitally. Crediting sources is good communication and is
done in a standardized form called a citation style."
Source: Citing Sources: Giving Credit where Credit is Due (UM Academic Integrity)
"Whenever you quote or base your ideas on another person's work, you must document the source you used. Even when you do not quote directly from another work, if reading that source contributed to the ideas presented in your paper, you must give the authors proper credit.
"Citations allow readers to locate and further explore the sources
you consulted, show the depth and scope of your research, and give
credit to authors for their ideas. Citations provide evidence for
your arguments and add credibility to your work by demonstrating
that you have sought out and considered a variety of resources.
In written academic work, citing sources is standard practice and
shows that you are responding to this person, agreeing with that
person, and adding something of your own. Think of documenting your
sources as providing a trail for your reader to follow to see the
research you performed and discover what led you to your original
Source: Citing Your Sources (UC Berkeley)