General Format
Author, AA. & Author B.B. (date). Title of Webpage/document. Website. https://www.someaddress.com/full/url
NOTE: Check out the author section on the Elements of APA Reference Lists to learn how to format multiple authors.
For Example
Harel, D., Katz, G., Marelly, R., & Marronn, A. (2015, January 23). Wise computing: Towards endowing system development with true wisdom. Cornell University. https://arxiv.org/abs/1501.05924
Corresponding In-Text Citation
(Harel et al., 2015)
OR
Harel et al. (2015)