“Plagiarism, or unacknowledged borrowing, refers to representing another person’s material as one’s own without appropriate references. This includes research plans, manuscripts, articles, other texts or parts of them, visual materials, or translations. Plagiarism includes direct copying as well as adapted copying." Finnish Advisory Board on Research Integrity 2012, p. 33
Remember to document the source you have used. The citations styles vary by discipline so make sure to check the citation style used in your discipline from your department.
(Source: Veikko Surakka : Plagiointi opintosuorituksissa: plagiointityöryhmän alustava raportti, p. 8-9 (in Finnish)