Cita APA (7a ed.)

Gruber, G. R., & Gruber, E. C. (1977). Test of english as a foreign language (TOEFL) (1st edition.). Monarch Press.

Cita Chicago Style (17a ed.)

Gruber, Gary R., y Edward C. Gruber. Test of English as a Foreign Language (TOEFL). 1st edition. New York: Monarch Press, 1977.

Cita MLA (8a ed.)

Gruber, Gary R., y Edward C. Gruber. Test of English as a Foreign Language (TOEFL). 1st edition. Monarch Press, 1977.