Cita APA (7th ed.)

Hull, A. L., Machuca, B. G., Méndez, F., Robinett, R. F., Valle, K. M. d., Rojas, P. M., & Fries, C. C. (1953). Study of english as a second language. D. C. Heath.

Cita Chicago (17th ed.)

Hull, Adrian L., Belén G. Machuca, Francisca Méndez, Ralph F. Robinett, Katharene M. del Valle, Pauline M. Rojas, i Charles C. Fries. Study of English as a Second Language. Boston: D. C. Heath, 1953.

Cita MLA (9th ed.)

Hull, Adrian L., et al. Study of English as a Second Language. D. C. Heath, 1953.