APA (7th ed.) Citation

Bulgaria & United States. (2018). Scientific and technological cooperation: Protocol between the United States of America and Bulgaria, extending Agreement of January 4, 2008 ; signed at Washington, June 15, 2018. United States Department of State.

Chicago Style (17th ed.) Citation

Bulgaria and United States. Scientific and Technological Cooperation: Protocol Between the United States of America and Bulgaria, Extending Agreement of January 4, 2008 ; Signed at Washington, June 15, 2018. [Washington, D.C.]: United States Department of State, 2018.

MLA (9th ed.) Citation

Bulgaria and United States. Scientific and Technological Cooperation: Protocol Between the United States of America and Bulgaria, Extending Agreement of January 4, 2008 ; Signed at Washington, June 15, 2018. United States Department of State, 2018.