American Psychological Association (APA)
IGU. (n.d.). MDA Glossary. Retrieved February 8, 2023, from website: http://www.expertglossary.com/definition/igu.
Chicago Manual of Style (CMS)
IGU. www.mda.mil. MDA Glossary. DoD Missile Defense Agency. http://www.expertglossary.com/definition/igu (accessed: February 8, 2023).
Modern Language Association (MLA)
"IGU." MDA Glossary. DoD Missile Defense Agency. 8 February. 2023 http://www.expertglossary.com/definition/igu.