APA (7th ed.) Citation

Georgetown University, United States Interagency Language Roundtable, & Frith, J. R. (1980). Measuring spoken language proficiency. Georgetown University Press.

Chicago Style (17th ed.) Citation

Georgetown University, United States Interagency Language Roundtable, and James Robert Frith. Measuring Spoken Language Proficiency. Washington, D.C.: Georgetown University Press, 1980.

MLA (9th ed.) Citation

Georgetown University, et al. Measuring Spoken Language Proficiency. Georgetown University Press, 1980.