APA

LaBeouf, S. [thecampaignbook]. (2014, January 10). In light of the recent attacks against my artistic integrity, I am retiring from all public life. [Tweet]. Retrieved from https://twitter.com/thecampaignbook/status/421577950342160384

MLA

LaBeouf, Shia (thecampaignbook). “In light of the recent attacks against my artistic integrity, I am retiring from all public life.” 10 January 2014, 1:43 a.m. Tweet.

Chicago*

LaBeouf, Shia. Twitter post. January 10, 2014, 1:43pm. https://twitter.com/thecampaignbook/status/421577950342160384.

*Not sure on this one, but close enough.