A conference paper is a type of article that has been presented at a conference. They may be published in a number of different ways:
Conference papers collected in a conference proceeding can be published by a publisher in print or digital form. These conference proceedings might have editors who have compiled the collection of paper. In these cases the reference is created in a similar way to that of a book chapter. You might add a link if there is one available:
Author, A. A., & Author, B. B. (year). Title of paper. In C. Editor, & D. Editor (Ed./Eds.), Title of book or proceeding (pp. x–xx). Publisher. https://doi.org/xx.xxxx
Commentary: Write "In" followed by the editor(s) names and the abbreviation for editor/editors (Ed./Eds.) in parentheses. Use the abbreviation "pp." for pages and the page numbers in parentheses where the paper is found in the book/proceeding.
Katz, I., Gabayan, K., & Aghajan, H. (2007). A multi-touch surface using multiple cameras. In J. Blanc-Talon, W. Philips, D. Popescu, & P. Scheunders (Eds.), Lecture notes in computer science: Vol. 4678. Advanced concepts for intelligent vision systems (pp. 97–108). Springer. http://doi.org/10.1007/978-3-540-74607-2_9
Author, A. A., & Author, B. B. (year). Title of paper. Journal name, volume(issue), pages. https://doi.org/xx.xxxx
Duckworth, A. L., Quirk, A., Gallop, R., Hoyle, R. H., Kelly, D. R., & Matthews, M. D. (2019). Cognitive and noncognitive predictors of success. Proceedings of the National Academy of Sciences of the United States of America, 116(47), 23499–23504. https://doi.org/10.1073/pnas.1910510116
Conference paper can be found online on the conference website and not published in book or proceedings form (print or digital). In these cases you add the name of the conference, place, and web address:
Author, A. A., & Author, B. B. (year, date). Title of paper [Type of paper]. Conference name, city, country. https://xxxx
Maddox, S., Hurling, J., Stewart, E., & Edwards, A. (2016, March 30–April 2). If mama ain't happy, nobody's happy: The effect of parental depression on mood dysregulation in children [Paper presentation]. Southeastern Psychological Association 62nd Annual Meeting, New Orleans, LA, United States.
Kadav, A., & Swift, M. M. (2008, December 10–11). Live migration of direct-access devices [Paper presentation]. First Workshop on I/O Virtualization, San Diego, CA, United States. https://www.usenix.net/events/wiov08/tech/full_papers/kadav/kadav.pdf
(Kadav & Swift, 2008, p. 5)
(Kadav & Swift, 2008, para. 11)
(Kadav & Swift, 2008, Conclusion, para. 1)
(Kadav & Swift, 2008, "Migration between different devices", para. 3)