APA (7th ed.) Citation

Shelah, S., & Ulrich, D. (2018). $\leq_{SP}$ Can Have Infinitely Many Classes.

Chicago Style (17th ed.) Citation

Shelah, Saharon, and Danielle Ulrich. $\leq_{SP}$ Can Have Infinitely Many Classes. 2018.

MLA (9th ed.) Citation

Shelah, Saharon, and Danielle Ulrich. $\leq_{SP}$ Can Have Infinitely Many Classes. 2018.

Warning: These citations may not always be 100% accurate.