APA (7th ed.) Citation

CQ Press & Sage Publications. (2018). Washington information directory 2018?2019. CQ Press.

Chicago Style (17th ed.) Citation

CQ Press and Sage Publications. Washington Information Directory 2018?2019. Washington D.C.: CQ Press, 2018.

MLA (9th ed.) Citation

CQ Press and Sage Publications. Washington Information Directory 2018?2019. CQ Press, 2018.