Page URL:
https://www.etymonline.com/word/costly
HTML Link:
<a href="https://www.etymonline.com/word/costly">Etymology of costly by etymonline</a>
APA style:
Harper, D. (n.d.). Etymology of costly. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/costly
Chicago style:
Harper Douglas, “Etymology of costly,” Online Etymology Dictionary, accessed $(datetime), https://www.etymonline.com/word/costly.
MLA style:
Harper, Douglas. “Etymology of costly.” Online Etymology Dictionary, https://www.etymonline.com/word/costly. Accessed $(datetimeMla).
IEEE style:
D. Harper. “Etymology of costly.” Online Etymology Dictionary. https://www.etymonline.com/word/costly (accessed $(datetime)).